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• Internet Dropping?!

  - by stead1984

  I have a virtual DC running DNS and Routing and Remote Access, that routes ALL workstations Internet traffic out to the Internet, this works fine but noticed that the Internet drops occasionally. I've checked with our service provider (Managed Communications) and they are adamant that it's not their fault. The Internet drops seem to affect everyone. We also have a server configured to use the same Internet service on a different network over a site-to-site VPN connection which also suffers from packet drops. I've spoken to Cisco and have done many tests with Cisco and they believe the problem is down to the ISP. I'm wondering if it's a DNS issue, as the Internet service uses OpenDNS. Any ideas?

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• What is the difference between /sbin/nologin and /bin/false?

  - by Michael Hampton

  I have often heard it recommended that a user account should be disabled by setting its shell to /bin/false. But, on my existing Linux systems, I see that a great number of existing accounts (all of them service accounts) have a shell of /sbin/nologin instead. I see from the man page that /sbin/nologin prints a message to the user saying the account is disabled, and then exits. Presumably /bin/false would not print anything. I also see that /sbin/nologin is listed in /etc/shells, while /bin/false is not. The man page says that FTP will disable access for users with a shell not listed in /etc/shells and implies that other programs may do the same. Does that mean that somebody could FTP in with an account that has /sbin/nologin as its shell? What is the difference here? Which one of these should I use to disable a user account, and in what circumstances? What other effects does a listing in /etc/shells have?

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• Good maintained privacy Add-On/settings set that takes usability into account?

  - by Foo Bar

  For some weeks I've been trying to find a good set of Firefox Addons that give me a good portion of privacy/security without losing to much of usability. But I can't seem to find a nice combination of add-ons/settings that I'm happy with. Here's what I tried, together with the pros and cons that I discovered: HTTPS Everywhere: Has only pro's: just install and be happy (no interaction needed), loads known pages SLL-encrypted, is updated fairly often NoScript - Fine, but needs a lot of fine-tuning, often maintained, mainly blocks all non-HTML/CSS Content, but the author sometimes seems to do "untrustworthy" decission RequestPolicy - seems dead (last activity 6 months ago, has some annoying bugs, official support mail address is dead), but the purpose of this is really great: gives you full control over cross-site requests: blocks by default, let's you add sites to a whitelist, once this is done it works interaction-less in the background AdBlock Edge: blocks specific cross-site requests from a pre-defined whitelist (can never be fully sure, need to trust others) Disconnect: like AdBlock Edge, just looking different, has no interaction possibilities (can never be fully sure, need to trust others, can not interact even if I wanted to) Firefox own Cookie Managment (block by default, whitelist specific sites), after building own whitelist it does it's work in the background and I have full control All These addons together basically block everything unsecure. But there are a lot of redundancies: NoScript has a mixed-content blocker, but FF has it's own for a while now. Also the Cookie blocker from NoScript is reduntant to my FF-Cookie setting. NoScript also has an XSS-blocker, which is redundant to RequestPolicy. Disconnect and AdBlock are extremly redundant, but not fully. And there are some bugs (especially RequestPolicy). And RequestPolicy seems to be dead. All in all, this list is great but has these heavy drawbacks. My favourite set would be "NoScript Light" (only script blocking, without all the additonal redundant-to-other-addons hick-hack it does) + HTTPS Everywhere + RequestPolicy-clone (maintained, less buggy), because RequestPolicy makes all other "site-blockers" obsolete (because it blocks everything by default and let's me create a whitelist). But since RequestPolicy is buggy and seems to be dead I have to fallback to AdBlock Edge and Disconnect, which don't block all and and need more maintaining (whitelist updates, trust-check). Are there addons that fulfill my wishes?

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• SMTP hacked by spammer using base64 encoding to authenticate

  - by Throlkim

  Over the past day we've detected someone from China using our server to send spam email. It's very likely that he's using a weak username/password to access our SMTP server, but the problem is that he appears to be using base64 encoding to prevent us from finding out which account he's using. Here's an example from the maillog: May 5 05:52:15 195396-app3 smtp_auth: SMTP connect from (null)@193.14.55.59.broad.gz.jx.dynamic.163data.com.cn [59.55.14.193] May 5 05:52:15 195396-app3 smtp_auth: smtp_auth: SMTP user info : logged in from (null)@193.14.55.59.broad.gz.jx.dynamic.163data.com.cn [59.55.14.193] Is there any way to detect which account it is that he's using?

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• Sensitive data in init scripts

  - by Steve Jorgensen

  I'm adapting some examples I've found by Googling to build an init script to run a VirtualBox OSE virtual machine as a daemon. I would like to specify a password for VNC access to the VM, and this must be given as an argument to the VBoxHeadless command. Conventionally, init scripts are readable by standard users, and this seems like a useful convention, but I also don't want the VNC password for this VM to be stored in easily accessible plain text. What's the most appropriate/conventional way to handle this kind of situation? Maybe put a root-readable supporting data file someplace, and have the init script load the value from there?

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• What is the best Web Application Firewall for IIS?

  - by user30850

  What is the best Web Application Firewall(WAF) for IIS? What makes it better than the others? How useful is it at blocking attacks against poorly written code, otherwise known as an Intrusion Prevention System (IPS)? WAFs are required by the PCI-DSS, so if I have to get one, then it should the best one.

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• Basic IIS7 permissions question

  - by Tom Gullen

  We have a website, with a file: www.example.com/apis/httpapi.asp This file is used by the site internally to make requests joining two systems on the website together (one is Classic ASP, the other ASP.net). However, we do not want the public to be able to access the file. In IIS7.5, is there a setting I can do to make this file internal only? I've tried rewriting the URL for it but this rewrite is also applied internally so the scripts stop working as they fetch the rewritten url. Thanks for any help!

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• Setting up Shibboleth to secure part of a website

  - by HorusKol

  I've installed the Shibboleth module for apache on Ubuntu 10.04 using aptitude to install libapache2-mod-shib2 as per https://groups.google.com/group/shibboleth-users/browse_thread/thread/9fca3b2af04d5ca8?pli=1 and enabled the module (I have checked in /etc/apache2/mods-enabled) I then proceeded to secure a directory on the server by placing a .htaccess file with the following directives: AuthType shibboleth ShibRequestSetting requireSession 1 Require valid-user Now - I haven't set up an SSL host yet - and I also haven't set up the IdP - but I would expect that the server would block access to this directory - but I'm getting the content without any problems. I have restarted the apache service and I have no errors in the log files.

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• Hyper-V management remotely

  - by Péter

  I'll tell you in advance that I'm newbie in the topic. I have a Win8 (Home) machine with Hyper-V installed behind a router. The router has a public IP and a domain attached. I have another Win8 (Work) machine also installed Hyper-V. I want to access to my home Hyper-V via Hyper-V Manager so I can manage my virtual machines from work. I found this article but I don't know if it's applicable to me. I thought that a simple port forwarding should work and I only need to do is grant the Work HV manager my domain and the port I choose and if it's pop a login form I only need to fill the user data of my Home computer? How can I solve this? My thoughts revolve around: - Port forwarding - set domain+port and set my home user - Set up a VPN and use the local ip address of my home computer (it looks like a little cumbersome and my router only support PPTP) I'm open to any other solution too. Thanks, Péter

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• Wireless router not connection -> AP Not associated

  - by candido

  I can not connect to internet by wireless router after some months with ubuntu 10.04. I can connect with the same portable but with win OS. My SO is ubuntu 10.04 linux 2.6.32-41 arch SMP i686. The internet wireless network controller is Atheros AR9285 chipset (pci express) Kernel module ath9k I have tried a command line connection: $ sudo /etc/init.d/network-manager stop #stop gui network manager $ iwconfig wlan0 essid WLAN_3C key s:C001D20550B3C $ ifconfig Access Point: NOT-ASSOCIATED $dmesg ... AP 00:1a:2b:08:60:49 associated Is the SO has connected to router for booting long ( associated message), after boot and login why the connection to router is not possible by network-manager or command line (NOT associated message)? Thanks in advance

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• /etc/hosts.deny ignored in Ubuntu 14.04

  - by Matt

  I have Apache2 running on Ubuntu 14.04LTS. To begin securing network access to the machine, I want to start by blocking everything, then make specific allow statements for specific subnets to browse to sites hosted in Apache. The Ubuntu Server is installed with no packages selected during install, the only packages added after install are: apt-get update; apt-get install apache2, php5 (with additional php5-modules), openssh-server, mysql-client Following are my /etc/hosts.deny & /etc/hosts.allow settings: /etc/hosts.deny ALL:ALL /etc/hosts.allow has no allow entries at all. I would expect all network protocols to be denied. The symptom is that I can still web browse to sites hosted on the Apache web server even though there is a deny all statement in /etc/hosts.deny The system was rebooted after the deny entry was added. Why would /etc/hosts.deny with ALL:ALL be ignored and allow http browsing to sites hosted on the apache web server?

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• Users in ubuntu; Cant figure it out

  - by Camran

  I am the only one who will have access to my website. Just installed my VPS and managed to get most stuff working. However, stuck on the "members" part. Currently, everything has been done as "root". I have read posts that I should create a user, because root isn't ideal. I have found thousand guides on how to create a user, but now what to do next. 1- Should I create a user with adduser username and then add the user to a group? But which group? 2- And will the user then be able to do everything as I have done logged on as "root"? 3- And somebody plz explain what "sudo" has to do with this? (if anything at all) Thanks

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• How to create limited user accounts in Linux

  - by James Willson

  I want to create a user account for each of the key programs installed on my debian server. For example, for the following programs: Tomcat Nginx Supervisor PostgreSQL This seems to be recommended based on my reading online. However, I want to restrict these user accounts as much as possible, so that they dont have a shell login, dont have access to the other programs and are as limited as possible but still functional. Would anyone mind telling me how this could be achieved? My reading so far suggests this: echo "/usr/sbin/nologin" /etc/shells useradd -s /usr/sbin/nologin tomcat But I think there may be a more complete way of doing it. EDIT: I'm using debian squeeze

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• Picking up a lot of failed authentications for various accounts

  - by Josh K

  My server is getting a lot of various failed authentication attempts for various accounts. The most common one (that I've seen ) or the root account. I have since enabled Fail2Ban and ran several rootkit / malware checks to ensure I wasn't compromised. Is there anything else I should do? I only have three accounts enabled, and SSH access for only two. I have a full 48hr ban on anyone making more then six failed SSH login attempts. I do not have FTP enabled.

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• How to set up Drupal Plugin Manager on MAMP in a secure way?

  - by Andrei

  Hi, I use MAMP PRO as global webserver. First of all, is it a good idea? Secondly, my objective is to run a Drupal website with as easy management as possible. Now I want to use Plugin Manager module to install additional modules and themes for my website. It wants to use ftp for that, and I know that if I open access to FTP port then IT-department guys will come to me and ask to shut it down. So I wonder if there is a way to allow Plugin Manager to install modules, having the port 21 closed somehow?

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• Is it possible to add hardware on a remote machine and use it as if it was installed on the local machine?

  - by that0th3rGuy

  Probably a silly question. We have two computers in the apartment running Windows 7 and Windows Vista. 99% of the time we use headphones but every now and then we have a desire for some ambiance so we got a set of 2.1 speakers. But now only one of us has access to the speakers unless we move them around every now and then. So I was wondering if it's possible to add the other computer's sound card as a hardware device on my computer so that I can configure, for instance, Winamp to play through the other computer's sound card, hence the speakers connected to the other computer.

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• In Windows XP, is it possible to disable user credential caching for particular users

  - by kdt

  I understand that when windows caches user credentials, these can sometimes be used by malicious parties to access other machines once a machine containing cached credentials is compromised, a method known as "pass the hash"[1]. For this reason I would like to get control over what's cached to reduce the risk of cached credentials being used maliciously. It is possible to prevent all caching by zeroing HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\CachedLogonsCount, but this is too indiscriminate: laptops users need to be able to login when away from the network. What I would like to do is prevent the caching of credentials of certain users, such as administrators -- is there any way to do that in Windows XP? http://www.lbl.gov/cyber/systems/pass-the-hash.html

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• How secure is Remote Desktop from OSX to Windows Server 2003?

  - by dwhsix

  It's unclear to me exactly how secure Remote Desktop access from OSX to a Windows Server 2003 machine is. Is the communication encrypted by default? What level of encryption? Are there best practices for making this as secure as possible? I found http://www.mobydisk.com/techres/securing_remote_desktop.html but it's unclear how much of that is still relevant for current versions of RDP and Windows Server. I know I can tunnel RDP over ssh, but is that overkill or redundant? Thanks...

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• Remote script execution on Windows 2003 server - alternatives to PSEXEC

  - by chickeninabiscuit

  We are wanting to deploy our application to our Test server from our Hudson server. I'd like to be able to have hudson copy the application files and start a script that would run locally on our Test server. We can't use psexec because of a cross domain policy. Currently we are doing this manually, by RDPing to the Test server and checking out the code from subversion manually. Are there alternatives to PSExec that can bypass the cross domain policy problem?

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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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• Why are email transfers between mail servers often not encrypted? Why aren't users warned about it?

  - by AmV

  Users can often choose if they want to access their email provider (such as Gmail) using a secure channel (e.g. using HTTPS). However, to the best of my knowledge, when it comes to mail-server-to-mail-server communications, most emails are still transferred in plain text and not encrypted, making it possible to anybody on the network to read their content. Are there any technologies that give the user some guarantees that his emails are sent securely from end to end ? Why not let the user know when encryption is not supported and let him choose if he wants his email to be still delivered ?

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• Chrome - Why am I automatically authenticated to a web app even after clearing browser cookies?

  - by Howiecamp

  I am accessing a web application using Chrome. If I sign out of the app and clear all Chrome history/cookies/etc (even Flash cookies which are now handled by Chrome in the same Clear History area) and then re-access the site, I am automatically logged in without being prompted for credentials. I then launched Chrome in Incognito mode and was able to reproduce the same behavior. However, the I was prompted upon the first logon while in Incognito mode. The web application behaves as expected in Internet Explorer 10. Some info about the application: It's a Sharepoint site using NTLM authentication The credentials are Active Directory-based, as the username is domain\username My connection is over the Internet and there is no AD relationship between my local Windows account, my Windows PC. In other words I (meaning my locally logged on user and my PC) are not in any way part of their AD domain. The site is running SSL on port 443 Why might Chrome be automatically authenticating me?

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• Remote Software Solution that Acts as a Client

  - by Richard

  I am looking for something that I am not sure exists. I have a remote computer that will not allow incoming traffic due to ISP blocking of ports(basically double NAT situation that I am unable to get around). I am wondering if I have a computer acting as a client, is there any solution out there that will allow remote access to the computer. I do have other servers on the net that have static IP's that the computer could initiate a connection with. I am thinking of using Debian Linux, However computer is not built yet so OS is not overly important at this point.

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• Permissions required to look up a domain user's group memberships

  - by adrianbanks

  I am writing some code to look up the members of particular domain groups. Does the user that this application runs as need any particular permissions on the domain to get this information? Background: I have already determined that the application needs to be run as a domain user to be able to query information from the domain. I have a list of group names and for each group, I need to look up the members of that group on the domain and get their names/usernames.

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• Web Server Users - Best Practice

  - by Toby

  I was wondering what is considered best practice when several developers/administrators require access to the same web server. Should there be one non-root user with a secure username and password unqiue to the web server which everyone logs in as or should there be a username for each person. I am leaning towards a username for each person to aid in logging etc however then does the same user keep the same credentials over several servers, or should at least their password change depending on the server they are on? Should any non-root user of the system be added to the sudoers file or is it best practice to leave everyone off it and only let root perform certain tasks? Any help would be greatly appreciated.

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