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• Putting a Windows DC, Exchange in a DMZ

  - by blsub6

  I have one guy at my company telling me that I should put FF:TMG in between my main Internet-facing firewall (Cisco 5510) and put my Exchange server and DC on the internal network. I have another guy telling me that I should put the Exchange server and DC in a DMZ I don't particularly like the idea of having my mailboxes and DC's usernames/passwords in a DMZ and I think that Windows authentication would require me opening up so many ports between my DMZ and my internal network that it would be a moot point to have it out there anyways. What are some thoughts? How do you have it set up?

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• Gmail uses RC4 128bit - is it strong enough?

  - by al nik

  I notice that a service like Gmail is using RC4 128 bit as encryption. Is this strong enough to ensure that my emails can't be read by anyone one the net?

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• Using Password Safe on iPhone and Blackberry

  - by RandomBen

  I use Password Safe on my PC, http://passwordsafe.sourceforge.net/, to open my .psafe3 files. However, I have an iPhone and a blackberry. Is there any software packages for both or either that would allow me to use the password safe files I already have?

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• This operation has been cancelled due to restrictions in effect on this computer

  - by Dan

  I have this HUGELY irritating problem on Windows 7 (x64). Whenever I click on ANY link (that exists on a Word document, Excel or Outlook), I get an alert box with the message: This operation has been canceled due to restrictions in effect on this computer I have been scouring my settings and the Internet for a solution, but to no avail. What is the reason for this problem? It even happens when I click anchors in word document. That is, I can't even click on an entry in a Table of Contents to go to the appropriate page - I get this same error then. Is this a Windows 7 thing? Is there any way to turn this off?

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• Windows: View "all" permissions of a specific user or group

  - by peterchen

  For a Windows domain, is there a way to see for a certain user or group, where the user/group has permissions? Primarily: List which files / folders the user can access on a certain network share. (Kind of a recursive "effective permissions") However, other permissions would be cool as well. I believe I've seen such a tool in action, but I can't remember anything beyond that - so this might be a false memory. Recommendations?

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• Configuring linux server firewall to allow access from a certain range of IP addresses

  - by eggman20

  Hi Guys, I'm new to linux server. I'm currently trying to get an Ubuntu 10.10 server up and running for the first time and I'm using Webmin for administration. I'm stuck on the setting up the firewall. What I need to do is to ONLY allow a range of IPs (e.g 128.171.21.1 - 128.171.21.100) to access the HTTP server and Webmin. I've seen a lot of tutorials but none of them fits what I needed. Thanks in advance!

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• How to report a malicious site to Google, Microsoft, Mozilla, etc. so that they will warn users

  - by Jayapal Chandran

  I completed a project a year ago. Now a few modification were needed. While trying to test the site, there was an index.html file with a malicious script which had an iframe to another site's jar file. Kaspersky antivirus blocked it. I browsed via ftp to find the file and I deleted it. I also disabled directory listing. Maybe the ftp details of the site owner would have been hacked. I want to report this site to Google, Microsoft, Mozilla, and other antivirus providers. How do I do that? I hope kaspersky would have updated it in their database, but I still want to explicitly report this. Here is the popup kaspersky showed:

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• How to find on the Windows 7 who and when use(d) a certain share?

  - by John Thomas

  We have a workstation using Win7 on a LAN with a domain. On that workstation we set up some network shares. Can we find who used (user name and/or computer name) and when the shares? Note that we know about Computer Management System Tools Shared Folders Open Files. We don't want to see so much real-time who's using the shares but we are interested more in a logging solution, ideally interpreting / using the data from Win7's Event Viewer.

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• How to use basic auth for single file in otherwise forbidden Apache directory?

  - by mit

  I want to allow access to a single file in a directory that is otherwise forbidden. This did not work: <VirtualHost 10.10.10.10:80> ServerName example.com DocumentRoot /var/www/html <Directory /var/www/html> Options FollowSymLinks AllowOverride None order allow,deny allow from all </Directory> # disallow the admin directory: <Directory /var/www/html/admin> order allow,deny deny from all </Directory> # but allow this single file:: <Files /var/www/html/admin/allowed.php> AuthType basic AuthName "private area" AuthUserFile /home/webroot/.htusers Require user admin1 </Files> ... </VirtualHost> When I visit http://example.com/admin/allowed.php I get the Forbidden message of the http://example.com/admin/ directory. How can I make an exception for allowed.php? If not possible, maybe I could enumerate all forbidden files in another Files directive? Let's say admin/ contains also user.php and admin.php which should be forbidden in this virtual host.

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• Restrict Computer or Users from Internet but allow access to intranet and Windows Update / ePO?

  - by MoSiAc

  So this may be impossible but I've been asked to try and find something about it. So far nothing I have found is possible. I need to restrict specific machines or user accounts from regular Internet access but let them have access to the intranet portion of our network. I do not have Active Directory control, nor does anyone at my local workplace (corporate control in a different state). I have tried going through IPsec and doing this per local machine, but that system seems to have been removed from the images that are installed on these machines so that is out. So far the only other option I can think of is assigning the machines a specific ip address and removing their gateway access. This would probably work but the machines need to be able to receive updates that are being pushed to them through ePO and LanDesk. I would really like to do this on the user level because then if I need to do tech work to the machine and need internet access I can get to it but a "special" user could login and not be able to get into anything.

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• Apache httpOnly Cookie Information Disclosure CVE-2012-0053

  - by John

  A PCI compliance scan, on a CentOS LAMP server fails with this message. The server header and ServerSignature don't expose the Apache version. Apache httpOnly Cookie Information Disclosure CVE-2012-0053 Can this be resolved by simply specifying a custom ErrorDocument for the 400 Bad Request response? How is the scanner determining this vulnerability, is it invoking a bad request then looking to see if it's the default Apache 400 response?

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• Does a VPS need a firewall?

  - by Camran

  Do I need a firewall on my VPS which I ordered today? If so, which one would you recommend? I plan on running a classifieds website with Java, php, mysql. My OS is ubuntu 9.10 Thanks Btw: What is iptables?

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• Software Engineer's explanation of Facebook photo privacy, with UML diagram?

  - by Alex R

  Facebook photo privacy is more complex than most people think - including the bloggers who fill the Internet trying to explain it in simple terms. Not only there is the basic album-level privacy setting to consider, but also what happens with Tagging (and related privacy settings) as well as the Share button when clicked by a Friend. Has anybody seen a good, engineering-type (e.g. UML) diagram? I envision it should include the various privacy "states" a photo can be in, what causes state transitions, and the characteristics of each state? Thanks

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• Are there any soho class wireless routers capable of layer 2 encryption?

  - by Axxmasterr

  Are there any SOHO class wireless routers that are capable of encryption at layer 2?

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• How do I properly check if a program is a virus/trojan in VMware?

  - by acidzombie24

  How I should check if a program is a virus in VMware? Some programs I do need admin ability to install and it makes sense. But how do I know if it's doing more than I want? Some thoughts are: How many processes open when I launch the application What is added to the startup tab in msconfig If any services are added. That's pretty much all my ideas. Even if it does something I recognize I wouldn't know if it's necessary or not. What are some rule of thumb? -Edit- What about registries, can I use that information to help? Maybe have a scanner tell me if the application I just used has messed with sections (like bootup) it shouldn't have?

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• Can Solaris RBAC roles be ported to Linux using SElinux only?

  - by Jimmy

  We are migrating an application from Solaris to Linux and the main user is allowed, through the use of RBAC roles, to run a few system commands like svccfg/svcadm (chkconfig on redhat). Is it possible, using only SElinux (no sudo), to allow a normal user to run chkconfig off/on (basically give it the ability to add remove services) ? My approach was to try to create an SElinux user with a corresponding SElinux role that manages the app's domain/type and is allowed to transition to all other domains required to run chkconfig, tcpdump or any other system utility usually restricted to root access only. All my attempts so far have failed, so my second question would be where could I find good documentation that applies to this specific problem ?

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• Isolating Apache virtualhosts from the rest of the system

  - by JesperB

  I am setting up a web server that will host a number of different web sites as Apache VirtualHosts, each of these will have the possibility to run scripts (primarily PHP, possiblu others). My question is how I isolate each of these VirtualHosts from eachother and from the rest of the system? I don't want e.g. website X to read the configuration of website Y or any of the server's "private" files. At the moment I have set up the VirtualHosts with FastCGI, PHP and SUExec as described here (http://x10hosting.com/forums/vps-tutorials/148894-debian-apache-2-2-fastcgi-php-5-suexec-easy-way.html), but the SUExec only prevents users from editing/executing files other than their own - the users can still read sensitive information such as config files. I have thought about removing the UNIX global read permission for all files on the server, as this would fix the above problem, but I'm not sure if I can safely do this without disrupting the server function. I also looked into using chroot, but it seems that this can only be done on a per-server basis, and not on a per-virtual-host basis. I'm looking for any suggestions that will isolate my VirtualHosts from the rest of the system. PS I'm running Ubuntu 12.04 server

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• Apache httpd: Send error logs to syslog and local disk? Without touching /etc/syslog.conf?

  - by Stefan Lasiewski

  I have an Apache httpd 2.2 server. I want to log all messages using syslog, so that the requests are sent to our central syslog server. I also want to ensure that all log messages are sent to local disk, so that a sysadmin can have easy access to the log files on the local system. It is easy to send HTTP access logs to both the local disk and to syslog. One common method is: LogFormat "%V %h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined CustomLog logs/access_log combined CustomLog "|/usr/bin/logger -t httpd -i -p local4.info" combined But it is not easy to do this for error logs. The following configuration doesn't work, because the error logs only use the last ErrorLog stanza. The first ErrorLog stanza is ignored. ErrorLog logs/error_log ErrorLog syslog:local4.error How can I ensure that Apache errors logs are written to the local disk and are sent to syslog? Is it possible to do this without touching /etc/syslog.conf ? I am fine if my users want to manage their own Apache configuration files, but I do not want them touching system files such as /etc/syslog.conf

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• IE Flash whitelisting, disabling other ActiveX-es

  - by Maksee

  I use IE primarily for testing. Is it a way to add flash activex in some whitelist for good, while disabling all other activex-es?

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• The Story of secure user-authentication in squid

  - by Isaac

  once upon a time, there was a beautiful warm virtual-jungle in south america, and a squid server lived there. here is an perceptual image of the network: <the Internet> | | A | B Users <---------> [squid-Server] <---> [LDAP-Server] When the Users request access to the Internet, squid ask their name and passport, authenticate them by LDAP and if ldap approved them, then he granted them. Everyone was happy until some sniffers stole passport in path between users and squid [path A]. This disaster happened because squid used Basic-Authentication method. The people of jungle gathered to solve the problem. Some bunnies offered using NTLM of method. Snakes prefered Digest-Authentication while Kerberos recommended by trees. After all, many solution offered by people of jungle and all was confused! The Lion decided to end the situation. He shouted the rules for solutions: Shall the solution be secure! Shall the solution work for most of browsers and softwares (e.g. download softwares) Shall the solution be simple and do not need other huge subsystem (like Samba server) Shall not the method depend on special domain. (e.g. Active Directory) Then, a very resonable-comprehensive-clever solution offered by a monkey, making him the new king of the jungle! can you guess what was the solution? Tip: The path between squid and LDAP is protected by the lion, so the solution have not to secure it. Note: sorry if the story is boring and messy, but most of it is real! =) /~\/~\/~\ /\~/~\/~\/~\/~\ ((/~\/~\/~\/~\/~\)) (/~\/~\/~\/~\/~\/~\/~\) (//// ~ ~ \\\\) (\\\\( (0) (0) )////) (\\\\( __\-/__ )////) (\\\( /-\ )///) (\\\( (""""") )///) (\\\( \^^^/ )///) (\\\( )///) (\/~\/~\/~\/) ** (\/~\/~\/) *####* | | **** /| | | |\ \\ _/ | | | | \_ _________// Thanks! (,,)(,,)_(,,)(,,)--------'

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• Retrieve malicious IP addresses from Apache logs and block them with iptables

  - by Gabriel Talavera

  Im trying to keep away some attackers that try to exploit XSS vulnerabilities from my website, I have found that most of the malicious attempts start with a classic "alert(document.cookie);\" test. The site is not vulnerable to XSS but I want to block the offending IP addresses before they found a real vulnerability, also, to keep the logs clean. My first thought is to have a script constantly checking in the Apache logs all IP addresses that start with that probe and send those addresses to an iptables drop rule. With something like this: cat /var/log/httpd/-access_log | grep "alert(document.cookie);" | awk '{print $1}' | uniq Why would be an effective way to send the output of that command to iptables? Thanks in advance for any input!

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• How can I protect files on my NGiNX server?

  - by Jean-Nicolas Boulay Desjardins

  I am trying to protect files on my server (multiple types), with NGiNX and PHP. Basically I want people to have to sign in to the website if they want to access those static files like images. DropBox does it very well. Where by they force you to sign in to access any static files you put on there server. I though about using NGiNX Perl Module. And I would write a perl script that would check the session to see if the user was sign in to give them access to a static file. I would prefer using PHP because all my code is running under PHP and I am not sure how to check a session created by PHP with PERL. So basically my question is: How can I protect static files of any types that would need the user to have sign in and have a valid session created with a PHP script?

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• Enabling Bitlocker in Native VHD Boot

  - by Trevor Sullivan

  I have a laptop with a single hard drive, using the GUID Partition Table (GPT) disk layout, with the following partitions: 120MB EFI System Partition 300MB Microsoft Reserved Partition (MSR) Remainder - GPT primary partition I have a Windows 8 Professional VHD configured as a native-boot VHD on the GPT primary partition. Can I use Bitlocker to encrypt my main partition, or to encrypt the VHD volume?

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• Host's sys admins - can they view files?

  - by FullTrust

  Hi, Just a quick question. When using shared hosting, can system admins (employed by the host) access your files and read your database connectionstring details? Can they also access your database, and view the files, without a connectionstring? I'm assuming there's a certain level of trust, but is this possible/common? Thanks

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• How do anti-viruses work?

  - by Phoshi

  So I was thinking about viruses recently, and wondering how exactly antiviruses keep up? Considering anybody who'd been coding for a few weeks could hack together something do do nasty, nasty things to somebody's PC, the quantity alone would make a simple list of hashes prohibitive, so how do antiviruses do it? Do they monitor process activity and have a 3 strikes rule for doing virus-like things? And if so, what's stopping it from triggering on perfectly harmless things (like me moving files around in \system32)? I did a bit of googling, but the regular places didn't particularly help, and I couldn't find a dupe here, so I thought it'd be good to ask :)

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