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• Exploratory Question for Security Admins (/etc/passwd + PHP)

  - by JPerkSter

  Hi everyone, I've been seeing a few issues lately on a few of my servers where an account gets hacked via outdated scripts, and the hacker uploads a cPanel / FTP Brute forcing PHP script inside the account. The PHP File reads /etc/passwd to get the usernames, and than uses a passwd.txt file to try and brute force it's way in to 127.0.0.1:2082. I'm trying to think of a way to block this. It doesn't POST anything except "GET /path/phpfile.php", so I can't use mod_security to block this. I've been thinking of maybe changing permissions on /etc/passwd to 600, however I'm unsure how this will result in regards to my users. I was also thinking of rate-limiting localhost connections to :2082, however I'm worried about mod_proxy being affected. Any suggestions?

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• Migrate data from one server to another using rsync

  - by Leonid Shevtsov

  I'm moving from one VPS to another, and I figured that the simplest way to transfer data would be rsync. However, the data is owned by a user, www-data, which doesn't have ssh privileges, and I'd like it to be owned by the same (named) user on the target machine. Obviously I need all file permissions preserved. I have SSH access via another user with sudo privileges on both machines. Is this possible to do this with rsync?

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• Google Search w/ Chrome Incognito w/ Gnome Do

  - by jrc03c

  I've installed Google Chrome as my default browser in Ubuntu, and recently installed Gnome Do and enabled the Google Search plugin. The Google Search from Gnome Do works exactly as expected but for one thing: Chrome (which is typically set to open in "incognito" mode) does not open in "incognito" mode. The shortcuts on my desktop, taskbar, and menus all have the --incognito flag attached (which works just fine), but the browser refuses to open in this mode when launched from Gnome Do. Any suggestions? Also, please note the settings for the Google Search plugin in Gnome Do: It's obvious that Gnome Do just passes the Google Search blindly to the default browser. In other words, there are no configurable settings specifically for Chrome. Any thoughts?

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• Is there a way to find what values comes from what file in HAL under Ubuntu?

  - by vava

  I've been playing with multitouch on my Thinkpad and read a few tutorials on how to setup it. One of them mentioned /usr/hal/fdi/policy/20thirdparty/11-x11-synaptics.fdi, I edited it and enabled SHMConfig through it. Later I found out about /etc/hal/policy/ directory and put some customization for my touchpad there as well in separate fdi file. But now it looks like touchpad doesn't care about my customizations. I have gsynaptec installed and can configure it though GUI, I can configure it with synclient but I can't set any values through fdi files. I even turned off SHMConfig, reverting 11-x11-synaptics,fdi file to it's original state but it seems like SHMConfig still enabled, otherwise I wouldn't be able to configure properties in runtime. So, I was thinking, maybe there's additional hal files I don't know about. How can I find them, particularly ones responsible for turning SHMConfig on?

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• Intel cpu hyperthreading on or off for ibm db2?

  - by rtorti19

  Has anyone ever done any database performance comparisons with hyper-threading enabled vs disabled? We are running ibm db2 and I'm curious if anyone has an recommendations for enabling hyper-threading or not. With hyper-threading enabled it makes it quite difficult to do capacity planning for cpu usage. For example. "With 8 physical cores represented as 16 "threads" on the OS and a cpu-bound workload, does that mean when your cpu usage hit's 50% you are actually running at 100%." What real benefits do I gain with leaving hyper-threading enabled on an intel server running DB2? Does hyper-threading help if you're workload is truly disk IO bound? If so, up to what percentage? These are the types of questions I'm trying to answer. Any thoughts?

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• Apache security for multi-user development web server.

  - by mrmartinblue

  I've been searching and reading through documents all morning and understand that I need to use some combination of chown and probably 'jailing' to securely give programmers access to directories on my centos webserver. Here's the situation: I have an apache web server that has any number of virtual sites located in /var/www/site1 /var/www/site2 etc.. I have different developers that need full access both ssh and vsFTP to only the site they are working on. What is the best way to create and maintain security in this scenario. My thought would be to create a new user for each coder, jail that user to the website directory they are allowed to work in, add their user to a group and set the webroot's owner to that group. Any thoughts? Good, bad, ugly? Thanks!

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• Using public interfaces on a server connected through a GRE tunnel

  - by Evan

  I'm pretty new to networking so please forgive any terminology mistakes. I have 2 servers connected with a GRE tunnel. Server1 (10.0.0.1) ---- Server2 (10.0.0.2) I want to be able to bind to the public IPs on Server2 using Server1. To do this, I setup virtual interfaces with Server2's public IPs on Server1 and then used routing rules on Server1 to route the packets through the GRE tunnel. On Server1: ip rule add from [Server2's first public IP] table gre ip rule add from [Server2's second public IP] table gre ip route add default via 10.0.0.2 dev gre1 table gre This works great and I can see the packets arriving via GRE on Server2. I can see the packet exiting the tunnel on Server2's gre1 device as shown: From Server1: ping -I [Server2's public ip] google.com tcpdump from Server2's GRE tunnel device: 12:07:17.029160 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84) [Server2's public ip] > 74.125.225.38: ICMP echo request, id 6378, seq 50, length 64 This is exactly the packet I want. However, I'm not seeing it go out at all on eth0:0 (where Server2's public IP is bound to). I've tried to use routing rules to get packets coming from Server2's public IP (which would be coming out of dev gre1) to go through dev eth0 on the public default gateway and that doesn't work either. I'm at a loss, thank you to anyone who can help.

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• How would I force Debian to use the physical sector size on a hard disk?

  - by Confused User

  I just purchased a few new 3TB WD drives. These have physical 4k sectors, but there is some sort of layer which is providing 512B logical sectors (see the partition table below). In order to attempt to get some more speed out of my hard drives, I would like to get rid of this logical layer and actually use the physical 4k sectors. However, I can't figure out how to do this (or even if it's possible) from the man pages of fdisk and parted, or from searching Google. Does anybody know how this could be done? As to why this is relevant, this page demonstrates that meerly aligning the sectors properly can already make up to a 25% speed difference for reads, and more than 2500% for writes in some cases! Getting rid of the logical sectors in favor of the physicals ones should improve speeds even more. Thanks! $ parted /dev/sdc GNU Parted 2.3 Using /dev/sdc Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) print Model: ATA WDC WD30EZRX-00M (scsi) Disk /dev/sdc: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 3001GB 3001GB zfs 9 3001GB 3001GB 8389kB P.S. I don't care about the data on the drives, I was just playing with different file systems. Also, this is my first time posting here, so please let me know if my posts should be formatted differently, etc.

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• OpenSSL missing during ./configure. How to fix?

  - by P K

  I was trying to install node.js and found OpenSSL support missing during ./configure. How can I fix it? Is it a mandatory step? # ./configure Checking for gcc : ok Checking for library dl : not found Checking for openssl : not found Checking for function SSL_library_init : not found Checking for header openssl/crypto.h : not found /home/ec2-user/node-v0.6.6/wscript:374: error: Could not autodetect OpenSSL support. Make sure OpenSSL development packages are installed. Use configure --without-ssl to disable this message.

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• Calculate minimum ext3 partition size for certain amount of data

  - by Daniel Beck

  These following ext3 partitions contain identical data. As we can see, the larger the partition size, the more space is required for the same files: Filesystem 1K-blocks Used Available Use% Mounted on /dev/loop11 3965777 561064 3199964 15% [...] /dev/loop19 573029 543843 29186 95% [...] Filesystem Size Used Avail Use% Mounted on /dev/loop11 3.8G 548M 3.1G 15% [...] /dev/loop19 560M 532M 29M 95% [...] Filesystem Inodes IUsed IFree IUse% Mounted on /dev/loop11 1024000 1656 1022344 1% [...] /dev/loop19 1024000 1656 1022344 1% [...] I start with a partition of fixed size that possibly wasted a lot of space and I want to create a partition that is able to hold that data but with (almost) minimal size. How can I reliably calculate that minimal partition size needed for storing a certain amount of data? The amount of data changes over time, and I need to automate these calculations.

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• Best format for backing up data in Blu Ray

  - by Arrieta

  We are in the process of backing up our hard drives to Blu Rays. I am creating tar.gz files and burning them to Blu Ray. Is it possible to use a simple (preferably Python-based) solution for creating images of those tar.gz files, of a predetermined size (to fit in the Blu Ray), and simply burn this images to the disc? Do you have any other approach for creating physical back-up of your hard drives?

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• Cannot install CentOS 6.5 using UEFI usb boot

  - by Vaindil

  I am trying to dual-boot CentOS 6.5 on my desktop that is currently running Windows 8.1. I have two storage devices: an SSD that has my Windows installation, and an HDD that has all of my data. Both are formatted using GPT, and Windows boots using UEFI. I used the CentOS 6.5 live DVD (CentOS-6.5-x86_64-LiveDVD.iso) to create an EFI-bootable flash drive (it does boot properly in EFI mode). I receive an error, however, when CentOS is booting (error is below). I have a 6.4 boot DVD which boots as expected, but it does not boot in UEFI mode and therefore doesn't play nicely with my Windows installation (I have no way to access it, even using rEFInd or any other similar tools). What do I need to do to get the device to boot properly in UEFI mode? Kernel panic - not syncing: Attempted to kill init! Pid: 1, comm: init Not tainted 2.6.32-431.el6.x86_64 #1 Call Trace: [<ffffffff815271fa>] ? panic+0xa7/0x16f [<ffffffff81077622>] ? do_exit+0x862/0x870 [<ffffffff8118a865>] ? fput+0x25/0x30 [<ffffffff81077688>] ? do_group_exit+0x58/0xd0 [<ffffffff81077717>] ? sys_exit_group+0x17/0x20 [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b drm_kms_helper: panic occurred, switching back to text console

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• Setting up NFS server on Gentoo

  - by StackedCrooked

  I'm trying to set up an NFS server on a Gentoo VM. I've installed nfs-utils-1.2.2 and added the following line to the /etc/exports file: /root/svn 10.0.0.0/255.0.0.0(rw,sync,no_subtree_check) However, when I try to start the nfs service I get the following errors: gentoo-amd64-francis orig # /etc/init.d/nfs start FATAL: Could not load /lib/modules/2.6.24-9-pve/modules.dep: No such file or directory * Exporting NFS directories ... [ ok ] * Starting NFS mountd ... [ !! ] * Starting NFS daemon ... [ !! ] * Starting NFS smnotify ... [ ok ] It complains about not finding the /lib/modules/2.6.24-9-pve/modules.dep file, but the /lib/modules directory doesn't even exist on this machine. Can anyone help me getting it to work?

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• Erros installing archlinux on macbook air

  - by user1021852

  I have "installed" Archboot on my macbook air, and I am getting screen problems after it loads UDEV, it is last thing I can read. Basically I am following this instructions. But then I got error that when installing grub legacy. Something about that it has no support of gpt. And I cannot find anything about bios-compatibility. P.S. it only took one try too install it on macbook 6,2 and few dozens in macbook air without results.

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• Added user to CentOS, Updated sshd_config with AllowUsers, Login denied

  - by Gregg

  CentOS 5.3. I can SSH into the system as root just fine. Added a user and set their password. They have shell access (/bin/bash). I can su to the account from root just fine. I updated /etc/ssh/sshd_config with: AllowUsers myNewUser And restarted sshd: /etc/init.d/sshd restart When trying to ssh into the server with the new user, I get a permission denied. And yes, I've double and triple checked that I am using the correct password. Any help is appreciated.

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• How to report a bug against Ubuntu's upgrade process?

  - by Kim

  I just upgraded to lucid and discovered a nasty bug. It prevents the system from booting and took me hours to resolve. Now I'd like to report it along with the workaround I found. The only problem is: Where? Other such bugs have been filed against "update-manager", but that's just the GUI calling some scripts which do the real work. so what do I do? What should I substitute for XYZ in ubuntu-bug XYZ ?

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• Grub hangs at "Starting up ..." when USB flash card reader is plugged in (on Ubuntu Hardy)

  - by Laurence Gonsalves

  I have a PC with Ubuntu Hardy installed. The machine boots fine unless my USB flash card reader (one of those N-in-1 readers by MediaGear) is plugged in at startup. If the reader is plugged in, the boot process proceeds as normal until it gets to the screen that says "Starting up ...". At that point it just hangs forever. To work around this I currently leave the reader unplugged when booting, and then plug it back in after I see that Ubuntu is actually starting. This is annoying though, especially when I reboot the machine (typically for updates), forget to unplug the reader, and walk away only to come back hours later to find the machine hung. My guess is that the presence of the reader is confusing Grub about where to find the kernel. The weird thing is that Grub is on the same drive as the kernel I want it to boot so clearly the drive is still readable even when the flash card reader is plugged in. Is there some way I can tell Grub to never go looking on the flash card reader?

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• How to update Google chrome in Ubuntu?

  - by Oscar Reyes

  How to update Google chrome in Ubuntu?

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• How to get the Three.js import/export scripts into Blender on Ubuntu?

  - by Bane

  I have been working with 3D primitives in Three.js, but now I want to import some models. I plan on using Blender, which I have just downloaded with: sudo apt-get install blender However, I was instructed to put the import/export scripts in the .blender/2.62/scripts/addons folder, but it does not exist! .blender/2.62 does exist, but it only has a config folder. The next thing I did is manually changed the script search path in Blender's preferences from // to my homefolder/scripts, which contained the required io_mesh_threejs folder (which, in turn had the .py scripts inside). I saved the changes, restarted Blender, but still nothing: in the menu there is no mention of Three.js at all! What do I do? It would be great if I knew the installation path for Blender, because maybe I could put those scripts there manually. Where should it be installed? EDIT: these are the scripts I'm talking about, along with the instructions: https://github.com/mrdoob/three.js/tree/master/utils/exporters/blender.

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• XenServer Converting HVM to Paravirtualised

  - by Karl Kloppenborg

  Recently I have been tasked with the daunting process of converting a setup of HVM enabled VMs (running on Citrix XenServer 5.6.0) into PV (paravirtualised) containers. The constraints of the project was that: The operating system must be functionally identical after the migration. minimal modification to the operating system (with exception of kernel / drive mapping) I also was allowed to change the bootloader(ie, grub) in what ever way I see fit. However, I have attempted this, I will firstly like to show you my steps I took. This at the moment is CentOS5.5 specific: Steps: yum install kernel-xen This installed: 2.6.18-194.32.1.el5xen edited: /boot/grub/menu.lst changed my specs to match: title CentOS (2.6.18-194.32.1.el5xen) root (hd0,0) kernel /vmlinuz-2.6.18-194.32.1.el5xen ro root=/dev/VolGroup00/LogVol00 console=xvc0 initrd /initrd-2.6.18-194.32.1.el5xen.img Then I changed my xenserver parameters to match: xe vm-param-set uuid=[vm uuid] PV-bootloader-args="--kernel /vmlinuz-2.6.18-194.32.1.el5xen --ramdisk /initrd-2.6.18-194.32.1.el5xen.img" xe vm-param-set uuid=[vm uuid] HVM-boot-policy="" xe vm-param-set uuid=[vm uuid] PV-bootloader=pygrub xe vbd-param-set uuid==[Virtual Block Device/VBD uuid] bootable=true Some things to note, I am running a VolGroup LVM ;) Anyways, after all these steps (which aren't much!) I boot the VM and it boots initial kernel just fine, however I am presented with this error: Boot Screen: device-mapper: dm-raid45: initialized v0.2594l Waiting for driver initialization. Scanning and configuring dmraid supported devices Scanning logical volumes Reading all physical volumes. This may take a while... Activating logical volumes Volume group "VolGroup00" not found Creating root device. Mounting root filesystem. mount: could not find filesystem '/dev/root' Setting up other filesystems. Setting up new root fs setuproot: moving /dev failed: No such file or directory no fstab.sys, mounting internal defaults setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory Switching to new root and running init. unmounting old /dev unmounting old /proc unmounting old /sys switchroot: mount failed: No such file or directory Now my hints are that it cannot detect / because of the fact that when you change from HVM mode to PV it does something (not that obvious) When you make a SR (storage) on a HVM, you get it mounted to the guest os as /dev/hda. However in PV mode, this presents itself as /dev/xvda... Could this be the answer? and if so, how the heck to I implement it?? Update: So I have gotten a bit further in my quest, as it now detects the LVM's... To do this, I required to recompile the xen-kernel initrd image. Command: mkinitrd -v --builtin=xen_vbd --preload=xenblk initrd-2.6.18-194.32.1.el5xen.img 2.6.18-194.32.1.el5xen Now when I boot I get this: Boot Screen: Loading dm-raid45.ko module device-mapper: dm-raid45: initialized v0.2594l Scanning and configuring dmraid supported devices Scanning logical volumes Reading all physical volumes. This may take a while... Found volume group "VolGroup00" using metadata type lvm2 Activating logical volumes 3 logical volume(s) in volume group "VolGroup00" now active Creating root device. Mounting root filesystem. mount: error mounting /dev/root on /sysroot as ext3: Device or resource busy Setting up other filesystems. Setting up new root fs setuproot: moving /dev failed: No such file or directory no fstab.sys, mounting internal defaults setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory Switching to new root and running init. unmounting old /dev unmounting old /proc unmounting old /sys switchroot: mount failed: No such file or directory Kernel panic - not syncing: Attempted to kill init!

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• How to tell statd to use portmap on a non-localhost ipadress?

  - by jneves

  How can I make statd connect to other IP address other than 127.0.0.1? I have a server that is connected to 2 different networks (one is public, another a private). I want it to provide a NFS share for only the private network. The host in an ubuntu 8.04. The private ip address is 192.168.1.202 I changed /etc/default/portmap to add: OPTIONS="-i 192.168.1.202" The command lsof -n | grep portmap returns: portmap 10252 daemon cwd DIR 202,0 4096 2 / portmap 10252 daemon rtd DIR 202,0 4096 2 / portmap 10252 daemon txt REG 202,0 15248 13461 /sbin/portmap portmap 10252 daemon mem REG 202,0 83708 32823 /lib/tls/i686/cmov/libnsl-2.7.so portmap 10252 daemon mem REG 202,0 1364388 32817 /lib/tls/i686/cmov/libc-2.7.so portmap 10252 daemon mem REG 202,0 31304 16588 /lib/libwrap.so.0.7.6 portmap 10252 daemon mem REG 202,0 109152 16955 /lib/ld-2.7.so portmap 10252 daemon 0u CHR 1,3 960 /dev/null portmap 10252 daemon 1u CHR 1,3 960 /dev/null portmap 10252 daemon 2u CHR 1,3 960 /dev/null portmap 10252 daemon 3u unix 0xecc8c3c0 4332992 socket portmap 10252 daemon 4u IPv4 4332993 UDP 192.168.1.202:sunrpc portmap 10252 daemon 5u IPv4 4332994 TCP 192.168.1.202:sunrpc (LISTEN) portmap 10252 daemon 6u REG 0,12 289 3821511 /var/run/portmap_mapping I defined in /etc/hosts the following: 192.168.1.202 server.local In /etc/default/nfs-common I changed STATDOPTS to: STATDOPTS="--name server.local" Yet when I run /etc/init.d/nfs-common start if fails to start. The log shows: Jun 8 06:37:44 cookwork-web1 rpc.statd[9723]: Version 1.1.2 Starting Jun 8 06:37:44 cookwork-web1 rpc.statd[9723]: Flags: Jun 8 06:37:44 cookwork-web1 rpc.statd[9723]: unable to register (statd, 1, udp). An strace -f rpc.statd -n server.local results in a lot of lines, including this one: sendto(9, "\200]3\362\0\0\0\0\0\0\0\2\0\1\206\240\0\0\0\2\0\0\0\1"..., 56, 0, {sa_family=AF_INET, sin_port=htons(111), sin_addr=inet_addr("127.0.0.1")}, 16) = 56

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• send outgoing email via postfix from mail client

  - by Ey Jay

  I have installed postfix on my ubuntu that is hosted on digitalocean. What I want to do is. With my smtp server setup, I want to use it to send mail from my email client. I don't need to receive, I just need to send. I can telnet example.com 25 successfully, I received the email in my inbox, but when I tried using in a email client. smtp: example.com:25 user: smtp1user password: smtp1userpassword I get an error that says "Server doesn't respond. Try changing the port." I dont know how to proceed.

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• Estimating compressed file size using a list parameter

  - by Sai

  I am currently compressing a list of files from a directory in the following format: tar -cvjf test_1.tar.gz -T test_1.lst --no-recursion The above command will compress only those files mentioned in the list. I am doing this because this list is generated such that it fits a DVD. However, during compression the compression rate decreases the estimated file size and there is abundant space left in the DVD. This is something like a Knapsack algorithm. I would like to estimate the compressed file size and add some more files to the list. I found that it is possible to estimate file size using the following command: tar -cjf - Folder/ | wc -c This command does not take a list parameter. Is there a way to estimate compressed file size? I am also looking into options like perl scripts etc. Edit: I think I should provide more information since I have been doing a lot of web search. I came across a perl script(Link)that sort of emulates the Knapsack algorithm. The current problem with the above mentioned script is that it splits the files in their original state. When I compress the files after splitting them, there are opportunities for adding more files which I consider to be inefficient. There are 2 ways I could resolve the inefficiency: a) Compress individual files and save them in a directory using a script. The compressed file could provide a best estimate. I could generate a script using a folder of compressed files and use them on the uncompressed ones. b) Check whether the compressed file's size is less than the required size. If so, I should keep adding files until I meet the requirement. However, the addition of new files to the compressed file is an optimization problem by itself.

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• How can I install nVidia-drives on SLES11?

  - by Thomas Lötzer

  Hi, how can I install the nVidia drivers for their graphics cards on a SLES11 system? I can only find HOWTOs for OpenSuse and they don't seem to work on SLES11.

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• How can I fix puppet refusing to start and asking for "master.pp"?

  - by cwd

  I'm using the very latest version of puppet and have been following the Apress "Pro Puppet" guide step by step. I have installed puppet sudo aptitude install ruby libshadow-ruby1.8 sudo aptitude install puppet puppetmaster facter I have edited /etc/puppet/puppet.conf to include certname [master] certname=puppet.mydomain.com I have edited /etc/hosts and added the following line 127.0.0.1 puppet.mydomain.com puppet I have set the hostname of the server echo "puppet.mydomain.com" > /etc/hostname hostname -F /etc/hostname And then I try and run puppet from the command line. puppet master --verbose --no-daemonize And puppet gives me this error: Could not parse for environment production: Could not find file /master.pp I'm running all commands with sudo and the last line of the error message always says that it can't find master.pp and the path before it is to my current working directory. What am I doing wrong? I should also mention that I don't have a DNS record set up for puppet.mydomain.com - I saw some online documentation mentioning this might be a problem - however I was fairly sure that the hosts file would let me get around that.

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