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• Check if root ca certificate is installed

  - by Zulakis

  We are having a custom CA for our local-domains. The Root CA certificate is installed on all the corporate machines by default, but sometimes it happens that we have someone here who doesn't have it installed. If the user a) accesses our intranet using http or b) accepts the server-certificate I would like to redirect the user to a site which tells it what happened and how they can install the root CA. The only solution I found was the following: <img src="https://the_site/the_image" onerror="redirectToCertPage()"> This is barely a work-around and not really a solution. It can be triggered by other problems then the missing certificate. Are there any better solutions on how to solve this problem?

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• bind9 dns proxy

  - by Zulakis

  We are offering multiple SSL-enabled services in our local network. To avoid certificate-warnings we bought certificates for server.ourdomain.tld and firewall.ourdomain.tld. We now created a zone in our local DNS-server in which we pointed the hosts to the corresponding private-ips. Now, each time another record for ourdomain.tld, like for example www.ourdomain.tld or alike are changed, we need to update it on both our public-dns-server AND the local dns-server. I would like our local bind-dns to serve all the information from our public-dns but serve different information for these 2 hosts. I know I could possibly have our private-ips in our public-dns but I don't want that for security reasons. The internet dns-server is being managed by a third party, while we have full control of the intranet one. Because of this I am looking for a solution which lets the intranet retrieve the records from the internet one.

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• NTFS write speed really slow (<15MB/s) on Ubuntu

  - by Zulakis

  When copying large files or testing writespeed with dd, the max writespeed I can get is about 12-15MB/s on drives using the NTFS filesystem. I tested multiple drives (all connected using SATA) which all got writespeeds of 100MB/s+ on Windows or when formatted with ext4, so it's not an alignment or drive issue. top shows high cpu usage for the mount.ntfs process. AMD dual core processor (2.2 GHz) Kernel version: 3.5.0-23-generic Ubuntu 12.04 ntfs-3g version: both 2012.1.15AR.1 (Ubuntu default version) and 2013.1.13AR.2 How can I fix the writespeed?

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• apache2 default namevirtualhost

  - by Zulakis

  I got a site server.com which I want to be returned when it is directly adressed using server.com or www.server.com but issue a 404 if the webserver gets accessed using its ip or another hostname. I got something like the following: NameVirtualhost 10.0.0.1:80 <VirtualHost 10.0.0.1:80> #This should be used if Host is server.com or www.server.com ServerName server.com ServerAlias server.com www.server.com DocumentRoot /var/www/ </VirtualHost> <VirtualHost 10.0.0.1:80> #This should be used alternatively RewriteEngine On RewriteRule (.*) - [R=404] </VirtualHost> How can I now set that the second entry should be used if hostname is not server.com or www.server.com?

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• rsnapshot preexec

  - by Zulakis

  I am mounting my remote backup volume using a rsnapshot cmd_preexec script. If the /mnt/backup directory doesn't exist when starting rsnapshot i get this error: ERROR: /mnt/backup does not exist. If the directory exists and the preexec mounting fails, it does not stop rsnapshot resulting in the backup being backed up on the completely wrong server... What should I do about this? Edit: I know that I could use a wrapper-script, but I don't want to do this..

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• both ssl and non-ssl on single port

  - by Zulakis

  I would like to make my apache2 webserver serve both http and https on the same port. With the different method i tried it was either not working on http or on https.. How can I do this? Update: If I enable SSL and then visit the with http I get page like this: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Reason: You're speaking plain HTTP to an SSL-enabled server port.<br /> Instead use the HTTPS scheme to access this URL, please.<br /> <blockquote>Hint: <a href="https://server/"><b>https://server/</b></a></blockquote></p> <hr> <address>Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny16 with Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g Server at server Port 443</address> </body></html> Because of this, it seems very much possible to have both http and https on the same port. A first step would be to change this default-page so it would present a 301-Moved header. Update2: According to this, it is possible. Now, the question is just how to configure apache to do it.

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• Windows XP autostart process as administrator

  - by Zulakis

  I am looking for a way with which i can autostart a certain program on logon of a user with user-rights with administrator-rights. I already tried using task scheduler but it didn't work out because you got to enter a username with format machine\user and our pxe-image-deployment-system automatically patches the machine names so the entered domain\user stopped working. UPDATE: the runas.exe command does not seem appropiate for this task, too. If using /user:machinename\Administrator /savcred it is invalid after imaging. What one user suggested was using .\Administrator or localhost\Administrator but both didn't work on my XP SP3 machines.

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• compile ntp without ssl

  - by Zulakis

  I need to deploy ntp to a very space-critical pxe-imaging-system. (Yes, each KB matters.) Footprint needs to be as small as possible, so I want to compile ntp without linking openssl. According to the manual this is should be possible: If available, the OpenSSL library from http://www.openssl.org is used to support public key cryptography. The library must be built and installed prior to building NTP. The procedures for doing that are included in the OpenSSL documentation. The library is found during the normal NTP configure phase and the interface routines compiled automatically. Only the libcrypto.a library file and openssl header files are needed. If the library is not available or disabled, this step is not required. I already tried out ./configure --without-openssl however, this didn't help. This is my ldd output: ldd ntpd/ntpd linux-gate.so.1 => (0xb7706000) libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb76d5000) libcrypto.so.0.9.8 => /usr/lib/i686/cmov/libcrypto.so.0.9.8 (0xb7582000) librt.so.1 => /lib/i686/cmov/librt.so.1 (0xb7578000) libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb741d000) /lib/ld-linux.so.2 (0xb7707000) libdl.so.2 => /lib/i686/cmov/libdl.so.2 (0xb7419000) libz.so.1 => /usr/lib/libz.so.1 (0xb7404000) libpthread.so.0 => /lib/i686/cmov/libpthread.so.0 (0xb73eb000) The system I am compiling on is 32-bit debian lenny using openssl 0.9.8g-15+lenny16. What is the correct configure option to compile ntp without openssl?

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• dig show only answer

  - by Zulakis

  I want dig only to show the answer of my query. Normally, it prints out alot of additional info like this: ;; <<>> DiG 9.7.3 <<>> google.de ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55839 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;google.de. IN A ;; ANSWER SECTION: google.de. 208 IN A 173.194.69.94 ;; Query time: 0 msec ;; SERVER: 213.133.99.99#53(213.133.99.99) ;; WHEN: Sun Sep 23 10:02:34 2012 ;; MSG SIZE rcvd: 43 I want this to be reduced to just the answer section. dig has alot of options, a good one i found was +noall +answer ; <<>> DiG 9.7.3 <<>> google.de +noall +answer ;; global options: +cmd google.de. 145 IN A 173.194.69.94 It leaves out most of the stuff, but still shows this options thing. Any ideas on how to remove it using dig options? I sure could cut it out using other tools, but a option with dig itself would be the cleanest and nicest.

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• rsnapshot backup TO remote server

  - by Zulakis

  I just bought 100GB of "Cloud"-Space at Strato's HiDrive for remote server backups. They offer the following services: sftp,webdav,smb/cifs,rsync,scp Now i want to do a remote backup to my Backup-Space using rsnapshot. All the examples I found were only for backing up FROM remote servers to local machine, but not for backing up TO remote servers. How can I do incremental backups using rsnapshot using one of the protocols above?

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• NTFS write speed really slow (<15MB/s)

  - by Zulakis

  I got a new Seagate 4TB harddrive formatted with ntfs using parted /dev/sda > mklabel gpt > mkpart pri 1 -1 mkfs.ntfs /dev/sda1 When copying files or testing writespeed with dd, the max writespeed I can get is about 12MB/s. The harddrive should be capable of atleast 100MB/s. top shows high cpu usage for the mount.ntfs process. The system has a AMD dualcore. This is the output of parted /dev/sda unit s print: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 7814037168s Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 2048s 7814035455s 7814033408s pri The used kernel is 3.5.0-23-generic. The ntfs-3g versions I tried are ntfs-3g 2012.1.15AR.1 (ubuntu 12.04 default) and the newest version ntfs-3g 2013.1.13AR.2. When formatted with ext4 I get good write speeds with about 140MB/s. How can I fix the writespeed?

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• default virtual network interface

  - by Zulakis

  I got a single ethernet connection to a network but need multiple ips. Because of this, I am using virtual network interfaces like this: auto intern iface intern inet static address ... netmask ... gateway ...U auto intern:1 iface intern:1 inet static address ... netmask ... gateway ... I need to specify which IP should be used by default for outgoing traffic. How can I do that?

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• Windows Task Scheduler

  - by Zulakis

  i am trying to deploy a auto-starting program with Administrator Priviliges on our XP-SP1-machines. For this, i am using the Windows Task Scheduler. Since most of our machines get deployed by using a PXE-imaging-system, the Task fails because the Administrator user entered is for example r126/Administrator. If i only enter Administrator then it automatically changes to machinename/Administrator. Since the machinenames are automatically changes by the imaging-system, the tasks fail run. Any ideas on how to fix that?

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• openssh sftp chroot

  - by Zulakis

  I chrooted a user to the directory /var/www/upload using ChrootDirectory /var/www/upload in my etc/ssh/sshd_config. The permissions of all the files in var/www/upload is 755 and owner is root:upload_user. However, I still cannot modify the files. (Getting a permission denied error.) Is it possible if I create a subdirectory with ownership upload_user:upload_user. Is it, by any means, possible to allow my chrooted user to write to his / directory?

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• smtp(s) proxy to monitor outgoing spam

  - by Zulakis

  I am looking for a smtp proxy to install on our gateway which should monitor outgoing smtp traffic to identify the source of recently occuring spam attacks from our network. It would be enough if this could log all outgoing mails, no actual filtering must be done as I'm going to do this manually. Also, is it possible to monitor smtps ports 465 and 587 or is it necessary to completely block these ports to stop spam?

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