Fedora Security :: Securing A Server For Deployment In Untrusted Zone?
Apr 1, 2010
I have to deploy a server to some customers that should not be given access to the server itself. I know that nothing is 100% secure but I've searched without finding a decent answer (maybe I googled for the wrong terms ?)I need some advice about encrypted filesystem. * The server must boot without asking for a passphrase (the server will be in a restricted access area so typing a password could take a while). I can't store the password for luks in an unencrypted file so it seems a loop to me. The only way out I can see is to store the passphrase in the boot binaries (better than nothing...) but this results in more work for me.* possibly the customer should not be able to move the hard disks to another pc, i.e. reading the passphrase from some unique hardware ID. This is risky but I could add a master passphrase to be used in case of hardware replacement
View 3 Replies
ADVERTISEMENT
Mar 11, 2010
I am creating an FTP server using VSFTP. It will be in the wild, initially at least only functioning as an FTP server. I have the iptables config from the previous box I set up 3-4 years ago. I have also got private/public key authentication running with SSH to eliminate brute force attacks.
Here is where is my specific question. On the old server I set up something that allowed my clients to log in using accounts that were not system accounts but would translate to a single system account that was limited to FTP. I remember setting up a passwd account that had username / password pairs that FTP used for authentication.
What app is this? Is it just part of VSFTP or maybe SELInux? I really want to utilize this.
View 2 Replies
View Related
Nov 19, 2009
I am pretty new to the Fedora 11 world. I have maradns installed on it and I'm using it as my server. What is the best way to make my machine secure. This is just a project of mine so I can become familiar with sys admin on Fedora. It doesn't have to be ultra secure, just a decent level of security would be nice. Any links or information would be greatly appreciated. Btw, I currently have selinux disabled. I'm not familiar with it and it was giving me problems so I had to disable it.
View 4 Replies
View Related
May 21, 2011
iam working on mail server in redhat centos. i want to know how to secure my mail server for heavy loading , any monitoring tools in GUI or console , is any essential tool which is used in Like MNC for mail server..
i know few command in like top,netstat,etc through google but i willing to know some more
View 8 Replies
View Related
Jan 19, 2011
I'm running an SFPT server which my clients logon to using an FTP client. at the moment each client has a user name and password.
Thus far to improve security I've disabled root login but an looking for futrhrt ways to protect it from attack, having researched using google some of the security features suggested prevent the FPT clients from connecting.
Questions:
1- what further things can i do to secure my server that still allows it to be usable for FTP clients?
2- specifically is it possible to use non login pre-share key authentication?
How i set up the server is shown here: [url]
View 3 Replies
View Related
Jun 9, 2011
We want to set up a Linux server (hosting Git or later SVN repositories) which should have all stored data strongly encrypted, so that if one steals the server the data cannot be read. For example, our notebooks have all important data stored on a "true-crypted" partition.
We plan to access it with SSH private keys and only after successful login should the data be readable. The server would be located in our office, shut down at night and not be connected to the Internet directly, but only accessible in our intranet.
View 1 Replies
View Related
Nov 19, 2009
I'm still new to PHP and SQL, but all the tutorials I've found connect to the database like this:
PHP Code:
Right now I'm just doing local network tests before exposing everything to the Internet.
Wouldn't leaving the password in there as plain text be a huge security issue? I tried downloading the php file off the server, and it just comes down blank. So does PHP already have a security feature that doesn't allow anyone to just nab PHP files off the server?
And for Postgre, I have pg_hba.conf set up to "trust" it's own IP address:
Code:
Would I need to use something like Kerberos, PAM, or ident authentication? Right now the only plan is to use it as login system for a website. The clients themselves won't be accessing the DB itself, because all the DB access will be through PHP.
View 4 Replies
View Related
Jun 29, 2010
I ran the LiveCD of Fedora SecurityLab and noticed these ports open, 111,631, 34526.How can I close them and what runs behind them. I know 111 is rpcbind, 631 ipp and 34526 is unknown.
View 4 Replies
View Related
Jan 18, 2010
I am relatively new to linux having only used ubuntu 9.10. Trouble is for all the talk of how secure ubuntu is, truth is it kept getting remote hacked (I have a stalker who is messing with me) over and over so now I am going to try fedora in hopes of finally having a secure system. My question is, what steps do I need to take to try to secure Fedora 12?
View 9 Replies
View Related
Mar 19, 2009
I am having trouble trying to setup an FTP server, so i made a video lesson to show how it is done PROPERLY. I actually had this before, but it was poor quality, and i went through it a little fast; so this time it is better quality and i explain more details. You can find it here:
[Code]...
View 2 Replies
View Related
Jan 5, 2010
I run Slackware 13.0 and I have an apache server 2.2.13 with a postgresql 8.4.1 database attached to it via php 5.3.0. Both the apache server and the postgresql database are on the same machine.
I have the apache server port 80 exposed to the WAN. It is not a fqdm, it's just a simple IP address. On my index page, a user can login with a user/password that encrypts to md5 via postgresql and takes them into the database.
Here is the vulnerability. Can't a hacker just scan port 80 and find my ip address running apache. Go to my index page, see that I accept user/password for authentication into my postgresql database. Then they could setup a script to simply inject html GET requests of random users and passwords and use those values on the php page(the one where the action link is pointing to in the form tag) that contains user login/password in php to login to my postgresql database. There's nothing stopping that. It would be a simple dictionary attack.
I checked out postgresql documentation and it suggested using ldap, kerberos, or md5 and not trust. I'm using md5 already. I currently use fail2ban for proftpd and sshd and it works great. After 6 failed user/pass attempts on either of these services, the IP gets banned via iptables for 24 hours. I love it. I was wondering if I could use that. Of course postgresql port is not exposed to the WAN which is a good thing. I know that when I put in a wrong user/pass from my index page, I get sent to a default postgresql pg_connect warning page. Perhaps I can increase the verbosity of postgresql's logger, find the phrase that it spits out when there's been a bad login and create a filter using that.
I understand that the way it is currently setup, my server is pretty secure, but where there's a will there's a way. I just feel that my postgresql database is unprotected even tho the postgresql port is not exposed to the WAN. They could just bruteforce from the apache server.
View 12 Replies
View Related
Nov 19, 2010
I am using a linux fedora 12.0 with L7 filter and proxy as the main firewall for my system composed of some several hundred pcs. The port 80 is open for certain mac addresses these computers, that is to say that , only a few of these computers have access to internet and others have been denied. However, they have access to two specific websites on internet .
I would like to know that if there is a virus attack through these websites in form of executable adwares or malwares, can this linux firewall detect any information that might be directed out of those computers to the attacking source? In other words, is there s tuning in L7 filter or any other filter that can detect transfer of files or some bites through port 80 unrelated to normal http requests?
View 1 Replies
View Related
Feb 7, 2011
I was looking for some help getting a good list of IP tables and other security measures on my new Linux Centos VPS.. I have some files I wan't no one other than myself to have access to.. I will be running some gameservers on it on ports 7777 and 7778 though and I want to have VSFTPD running for fast file transfers.
View 1 Replies
View Related
Apr 27, 2011
There are multiple servers to be backed up. Different access rights exist in each server. There are two backup servers with plenty of disk space, one local, and one offsite. The local one feeds to the offsite one. The rsync command is being used to make a replica of backed up data. Deleted data is also being archived. There are two methods that have been considered: One is to have the individual servers run rsync which logs in to the backup server to push data. Two is to have the backup server run rsync which logs in to each individual server to pull data. Because system data is involved and meta information (like owning user) must be stored, root is required to access the data as well as to store it. That means everything runs as root both ends. So method one was quickly dismissed because each server would effectively have rights to access ALL the data on the backup server since it logs into the backup server as root. The security containment here involves different groups using different servers, and they need to be isolated from each other.
But even method two involves some risks that are a concern. This means one machine has access rights to every server. If the backup server were compromised, every machine could be compromised.What I'd like to find is some way to allow backups to be run without either machine granting root access to the other, while still running as root, or something equivalent, that allows accessing all data and storing all metadata. So I was looking at setting up an rsync daemon on each individual server (running as root so it can access what it is specified to access), and running an rsync client on the backup server (as root so it can store metadata). This opens network access issues. Any user on the network can connect to the rsync daemon. So password protection is needed. But this communication is also not encrypted, which exposes the password and the data should the network be sniffed.
So now I'm thinking about a non-root ssh login between machines. The backup server would login to a non-privileged user on each individual server and set up a secure forwarding channel to the rsync daemon. Is this the best that can be done? Is there a way to run rsync via SSL with key verification so it can all be done together? I'd like to have the rsync daemons configured to always talk SSL, and always verify the client's key against a list of authorized keys, and likewise the client verify the server's key against the known public key for that server.
View 14 Replies
View Related
May 12, 2010
I'm currently using Slackware 13.0 and have my machine behind a Linksys DD-WRT router. I believe the DD-WRT software has all ports blocked by default so opening up my machine for SSH login would only leave my system vulnerable at that port. To give an extra layer of security for that opened port, I've created the following script that would be invoked as the users' shell.
#!/bin/sh
#if SSH_CLIENT defined run nail with $SSH_CLIENT as an argument
if [[ -n ${SSH_CLIENT} ]]; then
[code]....
View 10 Replies
View Related
Jun 25, 2010
I have a mail server that accepts to relay from system in the trusted network. One of the systems in the trusted network is a webserver. On the webserver there are several scripts that send email.Let's focus on the PHP scripts. These use the mail() function for that.I am looking for means to reduce the potential abuse of the mail server when one of the PHP scripts is hacked.For the situation that the code is modified by a hacker or a new script is installed I would like to take this approach:
1) scan the system for scripts using the mail() function
2) generate a checksum list from these scripts
3) intercept email (being sent to sendmail) from these scripts
4) check if they match the checksum list
In theory (I will still have to implement it) this would take care of the situation in which new/modified scripts try to send email.
However, there is also the option of an exploit of some script. Are there any ideas on means to prevent email abuse for this situation (other that: make sure scripts cannot be exploited )?
View 2 Replies
View Related
Oct 8, 2010
I want to start using videos/music files downloaded from untrusted sources (BT,Sharing Forums, etc.). Haven't made this a habit b4 because of the security risks. I want to take steps to reduce the risk & protect my computer from anything malicious. What are some good choices for this? The biggest step I took so far is using Ubuntu since it's very virus resistant, but other threats do exist out there (rootkits, malicious scripts, etc.). When downloading files from untrusted sources, who knows what may be hidden inside.Some options I'm thinking about:
1) Using a VM (with Ubuntu installed inside) & playing the files inside the VM. If anything malicious happen, it would be trapped inside & I could easily revert to a clean snapshot.
2) Using AppArmor to restrict what the files or program used to play the files can/can't do. AA seems very complicated though.
Are the above overkill? Would it be sufficient enough to just open these files on a non-admin user account since no access to root or sudo?
View 4 Replies
View Related
Oct 7, 2010
At the login webpage of <[URL]>, the Time Warner Cable (TWC) Webmail site, I am immediately confronted with a warning that the Security Certificate is invalid & that the site is untrusted. This occurs with Firefox, Seamonkey, & Konqueror. This does not occur on Microsoft or Apple systems; I have checked other colleagues machines. I have manually overridden the warning & everything functions fine. I have contacted TWC & am awaiting their tests. But, I would like some independent corroboration from other users in the Linux community. Could some of you perform the test yourself on this URL? An error will be readily apparent.
View 14 Replies
View Related
Jul 10, 2011
That's the title of article at[URL]Did ubuntu do all this already or is it that ubuntu isn't secure out of the box that it is assumed to be?explain if these steps are applicable to ubuntu and why/why not.
View 5 Replies
View Related
May 20, 2011
I was recently connecting securely to the website where I have my mail account, and I connected through Tor. When doing so firefox presents me with the screen saying that the connection is untrusted and it can't verify the certificate. So I cancelled. I'm using torbutton and I turned torbutton to off and connected again with no problem. Then with torbutton on again, same thing (untrusted).
Is it possible the exit node I was going through is doing a man in the middle attack? However later when connecting through tor I did NOT get the warning about the site being untrusted. I really don't know what exit node I was using when I got the certificate warning and what exit node I was using when I did not recieve the warning. I don't know how long I stay on the same node or how/when it changes.
View 4 Replies
View Related
Aug 18, 2010
I had some help via email from someone drafting my CV into the correct table format with open office. It's a .pdf file but now unfortunately lists the author in the document tab of properties as that person.
Is there anyway to change it to my own name, and also how do I 'secure' the document so that it's not easy for people viewing it to copy and paste, I've heard this is why many people now use .pdf for their CVs/rsums?
View 2 Replies
View Related
Aug 10, 2010
We have a customer that wants to look at other possibilities regarding deployment of redhat server. They are now using Altiris. Do you have any other good software, free or not free.
View 1 Replies
View Related
Jul 10, 2010
What if someone tampered with some important security updates, and suddenly you get a rootkit instead?
View 4 Replies
View Related
Sep 3, 2010
I've read and re-read everything I can find about AppArmor, to no avail. On the whole, AppArmor isn't for me. However, rather than give up on it completely, I have an idea: create a profile that I could use as a template for any untrusted application, with the aim of 1) blocking it from network access and 2) blocking it from installing other applications. I've got as far as creating an empty profile:
Code:
# Generic AppArmor Profile for UntrustedApplication
#include <tunables/global>
/usr/sbin/UntrustedApplication {
#include <abstractions/base> }
What do I need to add to make this profile 100% permissive, except for the two exceptions stated above?
View 9 Replies
View Related
Jul 17, 2010
Quote:
ISC joined other key participants of the internet technical community in celebrating the achievement of a significant milestone for the Domain Name System today as the root zone was digitally signed for the first time. This marked the deployment of the DNS Security Extensions (DNSSEC) at the top level of the DNS hierarchy and ushers the way forward for further roll-out of DNSSEC in the top level domains and DNS Service Providers.
View 3 Replies
View Related
Nov 16, 2010
Anyone done a deployment of Samba3 > 3.3.4. Had to install this version as I am preparing a domain for Windows 7 computers. My installation on CentOS went well. smbd and nmbd are running OK. I am able to test user accounts with the
smbclient -U usertest \hostusertest
However, I cannot seem to be able to add a computer, even a Win XP workstation to the domain. I used smb.conf files from a previous Samba 3.0.28 with minimal modifications. Kindly forward your smb.conf file, here is mine:
[global]
workgroup = DOMAIN
netbios name = DOMAIN_SERVER
server string = Samba Server Version %v
passdb backend = tdbsam
log file = /var/log/samba/%m.log
max log size = 40 .....
View 5 Replies
View Related
Dec 21, 2010
I have a Linux OS, and I want to make it as an image so that I can install 20 servers with that image as baseline OS.How to do that? As I know:
1. kickstart == is only for new OS instalation, it needs a Linux CD source
2. systemimage == is for clone the partition (not massive deployment)
3. kiwi == only for SUSE
View 2 Replies
View Related
Sep 15, 2010
We have a public server and it can be accessed from any where through ssh.
My question is my server should not allow anyone directly to login as root user. First he should login as normal user then he should switch to root user.
I also have another questions is there any specific linux command is there to end other users ssh session without rebooting the server.
View 2 Replies
View Related
Jan 26, 2010
I installed OpenSSH via tasksel and am using Webmin for administration. I'd like to be able to SSH externally and want to setup the necessary public/private keys to use in FileZilla.
In Webmin, under Servers > SSH Server I can click 'Host Keys' and see an RSA key. Is this the public or private key for my server? Do I need to copy this into a text file to import it into FileZilla on my remote PC (that I want to connect from)? Is that all that needs to be done (aside from opening the port on my router/firewall)?
Is there an automated way to set this up via Webmin?
View 3 Replies
View Related
Feb 10, 2010
I bridged a connection using ettercap and have collected a few ips that I would like to block (IP Lag). Similar to what zone alarm and cain and abel accomplish in windows.I have tried adding the ip to iptables and tried using ufw to no avail.
View 9 Replies
View Related
