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  • Adding port forwardings programmatically on a ControlMaster SSH session

    - by aef
    I just found out about the ControlMaster/ControlPath feature of OpenSSH, which allows you to use a single SSH connection to run multiple terminals. As I often use SSH to use port forwarding to get encrypted and authenticated VNC sessions I instantly recognized that you can't add port forwardings to a remote server to which you already have an established connection. This sucks. Sometimes later I found out that you can circumvent this limitation by typing ~C in a running SSH terminal session. This opens up a command-line which allows you to add or remove port forwardings. My quesion now is: How can I add port forwardings on an existing SSH session which is using the ControlMaster/ControlPath feature, without the need to have access to a terminal session inside that SSH session. I need this to enable my script which starts a secure tunneled VNC connection for me to add and later remove its port forwardings. (I know I could use a terminal multiplexer such as GNU Screen or tmux, actually I'm doing this already. But I like the idea of using just one SSH session for serveral reasons.)

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  • If I scp a file through an intermediate server, is the file stored temporarily on the server?

    - by Blacklight Shining
    For the sake of simplicity (I find it easier to remember names than arbitrary letters), I will dispense with letters and use names to refer to the machines in this scenario. Say I have two machines, applejack and pinkie-pie, each on their own separate LANs and not in the same physical location. I also have a server, cadance, with a direct Internet-facing connection. I want to copy a file from applejack to pinkie-pie, so to avoid dealing with port forwarding and such, I set up an ssh tunnel from pinkie-pie to cadance (ssh -R etc cadance). Now I can connect to pinkie-pie from anywhere, by connecting to cadance and specifying an alternate port to use. I can also easily copy files to pinkie-pie with scp -P $that_port $some_file cadance:$some_path. My understanding of how it works is this: A secure connection is made from applejack to cadance I am authenticated to cadance A secure connection is made from applejack to pinkie-pie that spans the existing reverse tunnel and the new connection from step 1. I am authenticated to pinkie-pie Files are copied directly from applejack to pinkie-pie over this connection. Am I correct here? How secure is this approach? If I'm wrong…are files copied this way decrypted at cadance before being passed on to pinkie-pie? Is there a possibility that traces of unencrypted data could remain on cadance?

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  • Revert "Deny" permissions in Windows 7

    - by saurabhj
    I made a very dumb mistake and I am hoping there is a way to fix this without having to boot in through a Linux Live CD and extracting the data. My user login to my Windows 7 system is: John John is part of the Administrator's group. I have a folder called "C:\Users\John" I tried to make this folder accessible to ONLY John (and deny from all other Administrators) by going to the Folder, Right Click Secturity tab and then selecting all the checkboxes under "Deny" while having selected the "Administrators" group. As a result, I cannot access this folder from any of the accounts: "John" and "Administrator" as both of them belong to the Administrators groupd and deny permissions out-weigh the "Allow Permissions" Is there any way I could revert this back? Thanks a million!

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  • Howt to grant network access to LocalSystem account?

    - by Ian Boyd
    How do you grant access to network resources of the LocalSystem (NT AUTHORITY\SYSTEM) account? When accessing the network, the LocalSystem account acts as the computer on the network: ...and acts as the computer on the network. Or to say the same thing again: The LocalSystem account acts as the computer on the network: When a service runs under the LocalSystem account on a computer that is a domain member, the service has whatever network access is granted to the computer account, or to any groups of which the computer account is a member. How does one grant a "computer" access to a shared folder and files? Note: Computer accounts typically have few privileges and do not belong to groups. So how would i grant a computer access to one of my shares; considering that "Everyone" already has access? Note: workgroup

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  • GnuPG Command Line - Verifying KeePass Signature

    - by Stisfa
    I'm trying to verify the PGP Signature of the latest version of KeePass 2.14's setup file against this signature, but this is the output I receive: C:\Program Files (x86)\GNU\GnuPG>gpg.exe --verify C:\Users\User\Desktop\KeePass-2.14-Setup.exe gpg: no valid OpenPGP data found. gpg: the signature could not be verified. Please remember that the signature file (.sig or .asc) should be the first file given on the command line. C:\Program Files (x86)\GNU\GnuPG> I found this command here, but it made no mention about ".sig" or ".asc" files, so I figured I did something wrong. By reading (http://www.gnupg.org/documentation/manuals/gnupg/gpgv.html#gpgv), I further tried the following: C:\Program Files (x86)\GNU\GnuPG>gpg.exe --pgpfile C:\Users\User\Desktop\KeePass-2.14-Setup.exe gpg: Invalid option "--pgpfile" C:\Program Files (x86)\GNU\GnuPG> As you can see, the results are quite obfuscating... I took a look at this on SuperUser (http://superuser.com/questions/16160/short-easy-to-understand-explanation-of-gpg-pgp-for-nontechnical-people - I couldn't use "a href" due to the built in spam filter that discriminates against users with < 10 rep; this is the same reason for the link above this link), but none of the links seemed to really address my question, at least not directly enough for me to get any idea on how to move forward on this. Can anybody here help me with the esoteric technicality of OpenPGP & the associated use of the GnuPG program? I've felt pretty dumb learning VBS, but this is beyond humiliating: it's absolutely debilitating and maiming whatever confidence I had with my IT skills (then again, I have no justification for making any boast either, as I have yet to get my A+ Cert, lol).

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  • Can an external server be used to encrypt all traffic

    - by Pasta
    My work takes me to a number of places with WiFi connection. I want to be able to encrypt the traffic between my laptop and the internet. Can I do this with a VPN server? What is the best way to get this done? Is there a secure and reliable service that will help me do this? This is fairly important and might be shared by upto 2 people at a time. Is it better to get a server setup on a cloud hosting solution? Amazon?

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  • Anyone else being hit by traffic on TCP port 11370

    - by Jakub
    I've been watching my logs (Ubuntu 9.10 server) and dunno about any of you but I am getting a ton of traffic from sources like Russia, Romania, etc.. on port 11370 (my iptables are logndrop'ing it. But was just curious). Some googling revealed this info: http://www.keysigning.org/sks/ -which seems to use port 11370 & 11371 Could that be the service they are scanning for (i don't run it)? ICS shows this: https://isc.incidents.org/port.html?port=11370 Just curious what you guys think and if anyone has seen this before? If need be I can post my log on here, but its just a dropped log of TCP port 11370 from various IPs. Thought it was strange as thats the ONLY Port I seem to repeatedly be hit on (from logs). I'm running on a Linode (VPS) if that matters to annyone.

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  • Securely wiping a file on a tmpfs

    - by Nanzikambe
    I have a script that decrypts some data to a tmpfs, the directory is secure (permissions), the machine's swap is encrypted (random key on boot) and when the script is done it does a 35 pass wipe (Peter Gutmann) of the cleartext on the tmpfs . I do this because I'm aware wiping files on a journaling file system is insecure, data may be recovered. For discussion, here're the relevant bits extracted: # make the tmpfs mkdir /mnt/tmpfs chmod 0700 /mnt/tmpfs mount -t tmpfs -o size=1M tmpfs /mnt/tmpfs cd /mnt/tmpfs # decrypt the data gpg -o - <crypted_input_file> | \ tar -xjpf - # do processing stuff # wipe contents find . -type f -exec bcwipe -I {} ';' # nuke the tmpfs cd .. umount -f /mnt/tmpfs rm -fR /mnt/tmpfs So, my question, assuming for the moment that nobody is able to read the cleartext in the tmpfs while it exists (I use umask to set cleartext to 0600), is there any way any trace of the cleartext could remain either in memory or on disk after the snippet above completes?

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  • How can I leave the remote screen locked when I ARD/VNC/etc. to my Mac?

    - by Dominic Cooney
    I'm currently using Jolly's Fast VNC and Mac OS X's built-in VNC server (System Preferences, Sharing, Screen Sharing) to access my iMac remotely. Here's my problem: When I'm using the iMac remotely, the screensaver deactivates and the screen is unlocked. If someone had physical access to my iMac they could walk up to it and start using it. Is there some way I can set things up so that when I'm using my iMac remotely the screen stays locked, like Windows XP Professional does when you're using RDP? I know I can use X remotely with the iMac locked, but I would like to use Mac applications remotely, too.

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  • Cisco IOS rewrite http url

    - by ensnare
    Is there a way that I can configure my router to rewrite http requests? So for example, if: http://www.example.com/porn.gif is being accessed, it'll be re-written as: http://172.16.0.1/denied.gif But transparently returned to the client? Thank you.

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  • Only allow ssh connections to a specific domain

    - by Jared
    Hi, I have a server setup with several domains and subdomains. I'd like to limit ssh and sftp access so a user can only connect to xxx.domain1.com but I'm not sure where this is configured. Connecting via ay other domain/subdomain on the server should be refused. Thanks, J

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  • Implications and benefits of removing NT AUTHORITY\SYSTEM from sysadmin role?

    - by Cade Roux
    Disclaimer: I am not a DBA. I am a database developer. A DBA just sent a report to our data stewards and is planning to remove the NT AUTHORITY\SYSTEM account from the sysadmin role on a bunch of servers. (The probably violate some audit report they received). I see a MSKB article that says not to do this. From what I can tell reading a variety of disparate information on the web, a bunch of special services/operations (Volume Copy, Full Text Indexing, MOM, Windows Update) use this account even when the SQL Server and Agent service etc are all running under dedicated accounts.

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  • Does Juniper Networks provide keyloggers with their software?

    - by orokusaki
    I noticed that I had a "USB Mass Storage Device" plugged in when there wasn't in fact anything plugged in to any USB port. I turned it off via Windows (XP), but it's quite concerning. This was after installing Juniper Networks' software for VPN access to an IT guy's stuff. I also notice there is a service called "dsNcService.exe" which apparently is sending information over the internet (even when I'm not in VPN access). The process restarts itself when I end it. Should I be worried that this software is tracking my keystrokes and broadcasting them to my IT guy?

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  • Has anyone run an objective comparison of Nessus and Skipfish

    - by jldugger
    We recently set up Nessus, but the annual cost is not cheap. Recently Google published SkipFish which appears to compete in the area of webapps. As best I can tell, Nessus operates via a large database of known exploits. And, as best as I can tell, Skipfish automatically generates vulnerability tests. Has anyone done a comparison of the effectiveness of these two approaches yet?

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  • Finding latest successful logins and failed attempts to a CentOS server

    - by ahmad
    I'm looking for a log file or any service to report the latest login attempts which have failed due to username/password miss match. Is there such utility available for CentOS? (built-in is preferred) My second question, and more generally, I need a log file of penetration attempts to my server. Ideally, this log should contain all attempts including logins, httpd activities, and other conventional open ports.

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  • Protecting DNS entries from duplicate hostnames entering network

    - by Aszurom
    Given a Windows domain, with DNS provided by a server on that domain, I am curious about what happens if a guest joins the network attempting to use the same hostname as an existing server, and then tries to register that hostname in DNS with its DHCP address. Can this potentially be disruptive to the server, or is Windows DNS smart enough to spot a duplicate hostname and deny an auto-register request from that host? What actions can be taken to ensure that DNS for a hostname cannot be altered?

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  • outgoing DNS flood targeted to non-ISP hosts

    - by radudani
    Below is the specific traffic monitored at the network perimeter and originating from a user PC on Vista platform. My question is not about the effects of the flood, but about the nature of the source of it. Is this some known infection, or just an application went out of control? a standard NOD32 scan didn't find anything, as the user told me. Thank you for any hint. 14:40:10.115876 IP 192.168.7.42.4122 > 67.228.0.181.53: S 2742536765:2742536765(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.115943 IP 192.168.7.42.4124 > 67.228.181.207.53: S 3071079888:3071079888(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116015 IP 192.168.7.42.4126 > 67.228.0.181.53: S 3445199428:3445199428(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116086 IP 192.168.7.42.4128 > 67.228.181.207.53: S 2053198691:2053198691(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116154 IP 192.168.7.42.4130 > 67.228.0.181.53: S 2841660872:2841660872(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116222 IP 192.168.7.42.4132 > 67.228.181.207.53: S 3150822465:3150822465(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116290 IP 192.168.7.42.4134 > 67.228.0.181.53: S 1692515021:1692515021(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116358 IP 192.168.7.42.4136 > 67.228.181.207.53: S 3358275919:3358275919(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116430 IP 192.168.7.42.4138 > 67.228.0.181.53: S 930184999:930184999(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116498 IP 192.168.7.42.4140 > 67.228.181.207.53: S 1504984630:1504984630(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116566 IP 192.168.7.42.4142 > 67.228.0.181.53: S 546074424:546074424(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116634 IP 192.168.7.42.4144 > 67.228.181.207.53: S 4241828590:4241828590(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116702 IP 192.168.7.42.4146 > 67.228.0.181.53: S 668634627:668634627(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116769 IP 192.168.7.42.4148 > 67.228.181.207.53: S 3768119461:3768119461(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.117360 IP 192.168.7.42.4111 > 67.228.0.181.53: 12676 op8 Resp12*- [2128q][|domain] 14:40:10.117932 IP 192.168.7.42.4112 > 67.228.181.207.53: 44190 op7 NotAuth*|$ [29103q],[|domain] 14:40:10.118726 IP 192.168.7.42.4113 > 67.228.0.181.53: 49196 inv_q [b2&3=0xeea] [64081q] [28317a] [43054n] [23433au] Type63482 (Class 5889)? M-_^OS>M-JM-m^_M-i.[|domain] 14:40:10.119934 IP 192.168.7.42.4114 > 67.228.181.207.53: 48131 updateMA Resp12$ [43850q],[|domain] 14:40:10.121164 IP 192.168.7.42.4115 > 67.228.0.181.53: 46330 updateM% [b2&3=0x665b] [23691a] [998q] [32406n] [11452au][|domain] 14:40:10.121866 IP 192.168.7.42.4116 > 67.228.181.207.53: 34425 op7 YXRRSet* [39927q][|domain] 14:40:10.123107 IP 192.168.7.42.4117 > 67.228.0.181.53: 56536 notify+ [b2&3=0x27e6] [59761a] [23005q] [33341n] [29705au][|domain] 14:40:10.123961 IP 192.168.7.42.4118 > 67.228.181.207.53: 19323 stat% [b2&3=0x14bb] [32491a] [41925q] [2038n] [5857au][|domain] 14:40:10.132499 IP 192.168.7.42.4119 > 67.228.0.181.53: 50432 updateMA+ [b2&3=0x6bc2] [10733a] [9775q] [46984n] [15261au][|domain] 14:40:10.133394 IP 192.168.7.42.4120 > 67.228.181.207.53: 2171 notify Refused$ [26027q][|domain] 14:40:10.134421 IP 192.168.7.42.4121 > 67.228.0.181.53: 25802 updateM NXDomain*-$ [28641q][|domain] 14:40:10.135392 IP 192.168.7.42.4122 > 67.228.181.207.53: 2073 updateMA+ [b2&3=0x6d0b] [43177a] [54332q] [17736n] [43636au][|domain] 14:40:10.136638 IP 192.168.7.42.4123 > 67.228.0.181.53: 15346 updateD+% [b2&3=0x577a] [61686a] [19106q] [15824n] [37833au] Type28590 (Class 64856)? [|domain] 14:40:10.137265 IP 192.168.7.42.4124 > 67.228.181.207.53: 60761 update+ [b2&3=0x2b66] [43293a] [53922q] [23115n] [11349au][|domain] 14:40:10.148122 IP 192.168.7.42.4125 > 67.228.0.181.53: 3418 op3% [b2&3=0x1a92] [51107a] [60368q] [47777n] [56081au][|domain]

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  • Firefox: This connection is untrusted + Behind corporate firewall

    - by espais
    I've seen some similar issues strewn throughout Google's results about this, but none seem to be corporate-specific. I continually get the 'This connection is untrusted' screen every time I attempt to log into a secure site...for instance Gmail. This is pretty annoying as sometimes I have to go through the process of adding the exception two or three times before it finally lets me into Gmail. I am behind a corporate firewall, going through an internal proxy server to get to the Internet, so there is no possibility for me to update the firewall...etc. Does anybody know a way around this? Can it simply be disabled (and is that safe)? EDIT I'm going to reopen this question with a bit of new information. I have been using Google Chrome lately until today, and one thing that I noticed was that I never had this issue when using either Chrome or Internet Explorer. Is there something that these other browsers do that I need to manually do in FF?

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  • What folders to encrypt with EFS on Windows 7 laptop?

    - by Joe Schmoe
    Since I've been using my laptop more as a laptop recently (carrying it around) I am now evaluating my strategy to protect confidential information in case it is stolen. Keep in mind that my laptop is 6 years old (Lenovo T61 with 8 GB or RAM, 2GHz dual core CPU). It runs Windows 7 fine but it is no speedy demon. It doesn't support AES instruction set. I've been using TrueCrypt volume mounted on demand for really important stuff like financial statements forever. Nothing else is encrypted. I just finished my evaluation of EFS, Bitlocker and took a closer look at TrueCrypt again. I've come to conclusion that boot partition encryption via Bitlocker or TrueCrypt is not worth the hassle. I may decide in the future to use Bitlocker or TrueCrypt to encrypt one of the data volumes but at this point I intend to use EFS to encrypt parts of my hard drive that contain data that I wouldn't want exposed. The purpose of this post is to get your feedback about what folders should be encrypted from the general point of view (of course everyone will have something specific in addition) Here is what I thought of so far (will update if I think of something else): 1) AppData\Local\Microsoft\Outlook - Outlook files 2) AppData\Local\Thunderbird\Profiles and AppData\Roaming\Thunderbird\Profiles- Thunderbird profiles, not sure yet where exactly data is stored. 3) AppData\Roaming\Mozilla\Firefox\Profiles\djdsakdjh.default\bookmarkbackups - Firefox bookmark backup. Is there a separate location for "main" Firefox bookmark file? I haven't figured it out yet. 4) Bookmarks for Chrome (don't know where it's bookmarks are) and Internet Explorer ($Username\Favorites) - I don't really use them but why not to secure that as well. 5) Downloads\, My Documents\ and My Pictures\ folders I don't think I need to encrypt, say, latest service pack for Visual Studio. So I will probably create subfolder called "Secure" in all of these folders and set it to "Encrypted". Anything sensitive I will save in this folder. Any other suggestions? Again, this is from the point of view of your "regular office user".

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  • Restricted blogspot account. Unable to subscribe using Google Reader?

    - by keisimone
    I used blogspot.com and restricted its viewership to just its authors. However I cannot use Google Reader to subscribe to the RSS feed. Is there a workaround? I need to be notified somehow whenever somebody posts to that private blog. I am one of its authors. My blogspot.com allows me to set the readership to just its authors. So that is what I have done. I did not do any password protect settings at all.

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  • What is your favorite password storage tool?

    - by Marcel Levy
    Aside from personal passwords, I'm always juggling a number of project-specific passwords, including those for network, web and database authentication. Some authentication can be managed with ssh keys and the like, but everywhere I've worked I also faced the need for the management of passwords that need to be available to a number of different people. So what do you use, either for personal or team-based password management? Personally I'd like to hear about cross-platform tools, but I'm sure other people would be satisfied with Windows-only solutions. I know the stackoverflow podcast tackled this issue in #7 and #9, but I'm hoping we can come up with the definitive answer here. Update: Even though this question was asked before its sibling site existed, you should probably add your two cents to the more active question over at superuser, which is a more appropriate venue for this.

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