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• Connecting to a secure, graphical, x session using a stateless thin client

  - by npeterson

  I'm looking for an open source, non-proprietery solution to this problem, any help would be appreciated. I'd like to setup a server running Ubuntu Server. I'd then like to connect to this server from a stateless thin client and use an x-session. This would occur mostly over local area networks, but also possibly over the internet. What would be the ideal set of software to accomplish this from a security, and usability standpoint? Are there any ready-made stateless thin clients that don't require proprietery software?

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• Are Time Machine backups secure?

  - by Leandro Ardissone

  I have my Time Machine backups on an external disk (WD My Passport with no hardware encryption) and I'm worried if the data stored on the disk is safe in case somebody steals it and connect it to any Mac/PC. Does any Mac can browse the Time Machine backups? Or are they encrypted in any way? If no, is there a way to improve security of the backups, should I buy a hardware encryption based HD? Thanks.

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• postfix is unable to send emails to external domains

  - by BoCode

  Whenever i try to send an email from my server, i get the following error: Nov 13 06:37:21 xyz postfix/smtpd[6730]:connect from unknown[a.b.c.d] Nov 13 06:37:21 xyz postfix/smtp[6729]: warning: host X.com[x.y.z.d]:25 greeted me with my own hostname xyz.biz Nov 13 06:37:21 xyz postfix/smtp[6729]: warning: host X.com[x.y.z.d]:25 replied to HELO/EHLO with my own hostname xyz.biz Nov 13 06:37:21 xyz postfix/smtp[6729]: 2017F1B00C54: to=<[email protected]>, relay=X.com[x.y.z.d]:25, delay=0.98, delays=0.17/0/0.81/0, dsn=5.4.6, status=bounced (mail for X.com loops back to myself) this is the output of postconf -n: address_verify_poll_delay = 1s alias_database = hash:/etc/aliases alias_maps = body_checks_size_limit = 40980000 command_directory = /usr/sbin config_directory = /etc/postfix connection_cache_ttl_limit = 300000s daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 1 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 default_delivery_slot_cost = 2 default_destination_concurrency_limit = 10 default_destination_recipient_limit = 1 default_minimum_delivery_slots = 3 default_process_limit = 10000 default_recipient_refill_delay = 1s default_recipient_refill_limit = 10 disable_dns_lookups = yes enable_original_recipient = no hash_queue_depth = 2 home_mailbox = Maildir/ html_directory = no in_flow_delay = 0 inet_interfaces = all inet_protocols = ipv4 initial_destination_concurrency = 100 local_header_rewrite_clients = mail_owner = postfix mailq_path = /usr/bin/mailq manpage_directory = /usr/share/man master_service_disable = milter_default_action = accept milter_protocol = 6 mydestination = $myhostname, localhost.localdomain, localhost, $mydomain mydomain = xyz.biz myhostname = xyz.biz mynetworks = 168.100.189.0/28, 127.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases non_smtpd_milters = $smtpd_milters qmgr_message_active_limit = 500 qmgr_message_recipient_limit = 500 qmgr_message_recipient_minimum = 1 queue_directory = /var/spool/postfix queue_run_delay = 300s readme_directory = /usr/share/doc/postfix.20.10.2/README_FILE receive_override_options = no_header_body_checks sample_directory = /usr/share/doc/postfix.2.10.2/examples sendmail_path = /usr/sbin/sendmail service_throttle_time = 1s setgid_group = postdrop smtp_always_send_ehlo = no smtp_connect_timeout = 1s smtp_connection_cache_time_limit = 30000s smtp_connection_reuse_time_limit = 30000s smtp_delivery_slot_cost = 2 smtp_destination_concurrency_limit = 10000 smtp_destination_rate_delay = 0s smtp_destination_recipient_limit = 1 smtp_minimum_delivery_slots = 1 smtp_recipient_refill_delay = 1s smtp_recipient_refill_limit = 1000 smtpd_client_connection_count_limit = 200 smtpd_client_connection_rate_limit = 0 smtpd_client_message_rate_limit = 100000 smtpd_client_new_tls_session_rate_limit = 0 smtpd_client_recipient_rate_limit = 0 smtpd_delay_open_until_valid_rcpt = no smtpd_delay_reject = no smtpd_discard_ehlo_keywords = silent-discard, dsn smtpd_milters = inet:127.0.0.1:8891 smtpd_peername_lookup = no unknown_local_recipient_reject_code = 550 what could be the issue?

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• Smartphone Emulator for checking emails are readable

  - by celenius

  Is there an emulator that would enable me to test the appearance of an email as it is being read on a smartphone (without specifying the phone type)? What I would like to be able to do, is to send an email to this emulator, and then scroll down through the email using the emulator. Ive searched online, and any emulators I found are for testing software rather than exploring the visual appearance of email. I'm using Mac OSX - thanks in advance.

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• Forwarding emails from a domain

  - by Euwyn

  I generally use Google Apps to handle email domains. I'm unfortunately stuck in an infinite loop with Google [1] for one the domains I recently picked up. Right now I use Zerigo's awesome DNS services. How can I get [email protected] forwarded to my Gmail account? Better yet if this is a free/cheap solution and can work with multiple aliases going to different real email addresses ([email protected] - [email protected], [email protected] - [email protected]) [1] Long story. I alternate between "Sorry, you've reached a login page for a domain that isn't using Google Apps." and "This domain has already been registered with Google Apps." Seems like many others are having this issue and Google isn't doing anything about it.

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• Cron won't use msmtp to send emails in case of failed cronjob

  - by Glister

  I'm trying to configure a machine so that it will send me an email if one of the cronjobs output something in case of an error. I'm using Debian Wheezy. Cron is working normally (without the email functionality). msmtp is installed and configured. Have already symlinked /usr/{bin|sbin}/sendmail to /usr/bin/msmtp. I can send email by using: echo "test" | mail -s "subject" [email protected] or by executing: echo "test" | /usr/sbin/sendmail Without the symlink (/usr/sbin/sendmail) cron will tell me that: (CRON) info (No MTA installed, discarding output) With the symlinks I get: (root) MAIL (mailed 1 byte of output; but got status 0x004e, #012) Can you suggest how to config the cron/msmtp pair? Thanks! EDIT: Note: I've written "msmtpd" by mistake. Its not a daemon but rather an SMTP client named just "msmtp" (without the "d" ending). It is executed on demand and it is not running in the background all the time. When I try to send an email by using msmtp like that it works: echo "test" | msmtp [email protected] On the far side, in the logs of the SMTP server I read: Nov 2 09:26:10 S01 postfix/smtpd[12728]: connect from unknown[CLIENT_IP] Nov 2 09:26:12 S01 postfix/smtpd[12728]: 532301C318: client=unknown[CLIENT_IP], sasl_method=CRAM-MD5, [email protected] Nov 2 09:26:12 S01 postfix/cleanup[12733]: 532301C318: message-id=<> Nov 2 09:26:12 S01 postfix/qmgr[2404]: 532301C318: from=<[email protected]>, size=191, nrcpt=1 (queue active) Nov 2 09:26:12 S01 postfix/local[12734]: 532301C318: to=<[email protected]>, orig_to=<[email protected]>, relay=local, delay=0.62, delays=0.59/0.01/0/0.03, dsn=2.0.0, status=sent (delivered to command: IFS=' ' && exec /usr/bin/procmail -f- || exit 75 #1001) Nov 2 09:26:12 S01 postfix/qmgr[2404]: 532301C318: removed Nov 2 09:26:13 S01 postfix/smtpd[12728]: disconnect from unknown[CLIENT_IP] And the Email is delivered to the target user. So it looks like that the msmtp client is working properly. It has to be something in the cron/msmtp integration, but I have no clue what that thing might be. Can you help me?

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• How (in)secure are cell phones in reality?

  - by Aron Rotteveel

  I was recently re-reading an old Wired article about the Kaminsky DNS Vulnerability and the story behind it. In this article there was a quote that came across a little bit exaggerated to me: "The first thing I want to say to you," Vixie told Kaminsky, trying to contain the flood of feeling, "is never, ever repeat what you just told me over a cell phone." Vixie knew how easy it was to eavesdrop on a cell signal, and he had heard enough to know that he was facing a problem of global significance. If the information were intercepted by the wrong people, the wired world could be held ransom. Hackers could wreak havoc. Billions of dollars were at stake, and Vixie wasn't going to take any risks. When reading this I could not help but feel like it was a bit blown-up and theatrical. Now, I know absolutely nothing about cell phones and the security problems involved, but to my understanding, cell phone security has quite improved over the past few years. So my question is: how insecure are cell phones in reality? Are there any good articles that dig a bit deeper into this matter?

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• Public folder emails not being delivered

  - by Rob

  Hello, We have just introduced an Exchange 2010 installation into our existing Exchange 2003 (all standard) environment. We make a lot of use of our Public Folders in 2003, so I am wanting to make a small PF tree in the 2010 system to test some applications against. I have created a few public folders in the 2010 public folder management tool, and mail enabled them, gotten email addresses, etc. However, mail will not be delivered, it queues on my existing 2003 Exchange server's 'Local Delivery' queue, and eventually times out and bounces. I guess the Exchange 'system' including the new 2010 server thinks that all public folder email must need to be delivered to the old 2003 server. Is it possible for me to have two public folder databases that each receive mail? If so, is there something I am missing to enable this? Thanks -R

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• How secure are third party Ubuntu (APT) repository mirrors

  - by bakytn

  Hello! We have locally an Ubuntu mirrors to save a lot of traffic (our external traffic is not free) So whenever I apt-get install "program" it gets from that repository. the question is...basically they can substitute any package with their own? So it's 100% on my own risk and I can be hacked easily on any apt-get upgrade or a-g install or a-g dist-upgrade? for example the very basic ones like "telnet" or any other.

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• Bad ways to secure wireless network.

  - by Moshe

  I was wondering if anybody had any thoughts on this, as I recently saw a Verizon DSL network set up where the WEP key was the last 8 characters of the router's MAC address. (It's bad enough that hey were using WEP in the first place...)

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• Including sender email address when forwarding emails with Outlook 2007

  - by Roee Adler

  When forwarding an email in Outlook (I have 2007), the header of the previous email shows. Sometimes it may show as follows: From: Joe Shmoe Sent: Saturday, June 12, 2010 10:01 PM To: Roee Adler Subject: Following our previous conversation Other times it will include the actual email address of the sender of the previous mail: From: Sponge Bob [mailto:[email protected]] Sent: Saturday, June 12, 2010 2:26 PM To: Roee Adler Subject: Sponges and other stuff How do I force every forwarded email to include the mail address? When forwarding from my iPhone it constantly keeps the address just the way I want it, but from Outlook it seems to depend on whether the sender is a contact of mine or not. The reason I need this is for 37signals' Highrise CRM system.

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• How secure is Windows IPSec VPN?

  - by sergeb

  I know the answer is, depends on how you configure it... But bare with me - our IPSec Site-to-Site VPN is configured by one of the most trusted hosting companies. One of our clients expressed concerns that "Windows Server 2008 Server IPSEC is not ICSA certified and lacks some of the common features for maintaining VPN stability" (they refer to the lack of "auto keep live" feature). They also are saying that "Windows platforms are not recommended as VPN endpoints due to security concerns and this is one reason that the ICSA testing labs will not certify it as a valid IPSEC solution" (I couldn't find a proof to this one) Are there any whitepapers or references that can prove the security of Windows IPSec implementation? Thanks!

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• editing automated SharePoint emails

  - by Richard Collins

  Sharepoint sends out an automated email when a site collection has reached its quota warning level. The email says: You are receiving this e-mail message because you are an administrator of the following SharePoint Web site, which has exceeded the warning level for storage: https://mysite.xxx.ac.uk/personal/xxx/. To see how much storage is being taken up by this site, go to the View site collection usage summary: https://mysite.xxx.ac.uk/personal/xxx/_layouts/Usage.aspx. The problem is that the usage summary link needs to point somewhere else instead. How can I edit the body of the email to change the link? Thanks.

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• How to secure a directory in Apache using a PHP session

  - by Cogsy

  I have a site that uses PHP session for authentication. There is one directory that I would like to restrict access to that does not use any PHP, it's just full of static content. I just don't know how to restrict access without every request going through a PHP script. Is there some way to have Apache check the session credentials and restrict access like Basic Auth?

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• Secure data hosting...

  - by kylex

  I've looked online and can't seem to find a proper answer. We have a client that requires very sensitive data be stored in a database. Is there a hosting company that provides high-level database security (this is for a bank).

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• Cron won't use msmtpd to send emails in case of failed cronjob

  - by Glister

  I'm trying to configure a machine so that it will send me an email if one of the cronjobs output something in case of an error. I'm using Debian Wheezy. Cron is working normally (without the email functionality). msmtp is installed and configured. Have already symlinked /usr/{bin|sbin}/sendmail to /usr/bin/msmtpd. I can send email by using: echo "test" | mail -s "subject" [email protected] or by executing: echo "test" | /usr/sbin/sendmail Without the symlink (/usr/sbin/sendmail) cron will tell me that: (CRON) info (No MTA installed, discarding output) With the symlinks I get: (root) MAIL (mailed 1 byte of output; but got status 0x004e, #012) Can you suggest how to config the cron/msmtp pair? Thanks!

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• Import emails from Claws IMAP cache

  - by calandoa

  I am trying to import an IMAP account composed of many folders from Claws Mail internal cache. Claws is unfortunately unable to export all the folders by selecting the root account. When checking the internal Claws cache folder, each mail is a plain text file named as following: base_path/My Account/Folder ABC/1 base_path/My Account/Folder ABC/2 base_path/My Account/Folder ABC/3 base_path/My Account/Folder ABC/4 base_path/My Account/Folder DEF/1 base_path/My Account/Folder DEF/2 base_path/My Account/Folder DEF/3 base_path/My Account/Folder X/etc... I tried to import this structure with different mails reader like KMail and Balsa, but each import failed. I just would like all these mails easily accessible and readable. Which tool on Linux can I use to import such a structure?

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• How do I secure Sql Server 2008 R2

  - by Mark Tait

  I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

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• iptables secure squid proxy

  - by Lytithwyn

  I have a setup where my incoming internet connection feeds into a squid proxy/caching server, and from there into my local wireless router. On the wan side of the proxy server, I have eth0 with address 208.78.∗∗∗.∗∗∗ On the lan side of the proxy server, I have eth1 with address 192.168.2.1 Traffic from my lan gets forwarded through the proxy transparently to the internet via the following rules. Note that traffic from the squid server itself is also routed through the proxy/cache, and this is on purpose: # iptables forwarding iptables -A FORWARD -i eth1 -o eth0 -s 192.168.2.0/24 -m state --state NEW -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A POSTROUTING -t nat -j MASQUERADE # iptables for squid transparent proxy iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j DNAT --to 192.168.2.1:3128 iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128 How can I set up iptables to block any connections made to my server from the outside, while not blocking anything initiated from the inside? I have tried doing: iptables -A INPUT -i eth0 -s 192.168.2.0/24 -j ACCEPT iptables -A INPUT -i eth0 -j REJECT But this blocks everything. I have also tried reversing the order of those commands in case I got that part wrong, but that didn't help. I guess I don't fully understand everything about iptables. Any ideas?

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• HOw to secure whm/cpanel centos server from javascript malacious code virus

  - by Master

  Recently my sites index.php code was replaced some malacious javascript virus code. I really don't know how did that entered into that page. Today when i tried to download that file via ftp then antivirus gave me the warning. So it means it was not entered from my computer. Is there any way to install some antivirus on VPS server with centos 5 , cpanel/whm so that those code should not be allowed to add. also what is mod_security . will it be helpful.

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• Solution for secure online remote presentation?

  - by Greg Joshner

  Hello, what is your (subscription free) solution to share a presentation with a number of users (below 50) that works without plug-ins in a browser and allows the presentation to be centrally controlled (and thus prevents participating users from "flipping forward")? I won't need print, save as or offline features, just showing and controlling a presentation centrally. Thanks a lot for your help!

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• VirtualBox - Continuous Integration with Secure virtual server

  - by stacker

  I have a repository on the host machine that I need to expose to the virtual machine but not the the other world (even other computers on the router). On the virtual machine I have a deployed web application that I need to be exposed to my host only. Is that can be achievable?

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• Postfix - How to configure to send these emails?

  - by Jon

  I want my mailserver to send mail from my local application "from" any user supplied email address "to" my own address, say "[email protected]". The MX records for "mysite.com" actually point to a different server, even though the outgoing mainserver is running with mydomain set as "mysite.com". Perhaps this is part of the problem? postfix is currently causing a SMTPRecipientsRefused error within the python application. Can anyone point me to what to change in the configuration? Thanks postconf -n: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 mydestination = mysite.com, localhost.com, , localhost, * myhostname = mysite.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes

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• Where can I get POP/IMAP settings for Windows Live Domain emails

  - by Capt.Nemo

  I have setup email for my custom domain using Windows Live Domains. I then upgraded from the Hotmail interface to the new Outlook.com interface. I cannot seem to find the POP/IMAP settings to connect to in the Settings Sections of the new Outlook.com interface. The only instructions I could find mentioned were using the Hotmail interface, and the corresponding section does not exist in the Outlook.com redesigned settings.

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• Writing scripts that work with my emails

  - by queueoverflow

  I currently use Thunderbird as my email client and it has some filters, but that seems to be all I can program in it. On several occasions, I heard people talk about their automated email workflow. One example: When I do not get a reply to an email the script will send a “nag” email asking why I did not get a response yet. Or another one: I get so much mail that I cannot read them all. After a week, unread email is put on hold and the sender gets a “if it was important, reply to this email and it will be set to un-hold” email. The script then takes the answer and move it to back into the important folder. I read about FiltaQuilla which seems nice, but it does not seem to be the kind of programming that I am looking for. How can I write general purpose scripts like those? Do I need to write my own Python IMAP/SMTP client (if that is even possible) to to this or can I script it it, say JavaScript, in Thunderbird?

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