Fedora Security :: Securing An FTP Server ?
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.
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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
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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.
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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
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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]
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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.
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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.
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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.
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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?
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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]...
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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.
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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?
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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.
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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.
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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]....
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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 )?
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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.
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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?
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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.
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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.
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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?
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May 16, 2011
I have a blog on my site and am using htaccess rewrite rules to block all those nasty scripts from trying to execute various things mostly relating to phpmyadmin and wordpress. This has reduced my httpd error logs to less than half from before.
Am trying to come up with a rule to rewrite all calls to certain files if they are not originating from my domain, here is how it looks right now but it's not working as I can see scripts trying to hit "wp-comments-post.php" getting a 500 Internal Server Error.
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Jul 20, 2011
I have an Ubuntu Lucid server that is public facing. I haven't really configured much on it except installing SSH (sshd) and Apache (httpd); I don't have a firewall or anything. Are there some common rules that I should follow to secure my system? I've been following this article on securing my Apache.
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Apr 15, 2011
What are the steps to and Procedure to follow for securing Linux Server???
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May 8, 2010
About apache security. How to protect web-server from programms like phpshell [url]?
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Nov 29, 2010
Recently I've been going over a few resources (like Guide to the Secure Configuration of Red Hat Enterprise Linux 5) some forum members have provided and I've been using other resources I use for work (like the UNIX STIG requirements). I would like to improve my skill-set on hardening a linux server (for work and personal interest). Is there a specific linux distro I can install that is purposely corrupted/vulnerable where the sole goal is to secure it, and then have the means to scan it to make sure all vulnerabilities are patched and secured?
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Feb 6, 2010
We are trying to define an appliance based on Suse for an application server and Web server Apache, so we would like to know configuration best practices for network and security, is there any paper/doc about best practices?
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Sep 27, 2009
I would like to know how to change the uname -a result in my server, i mean if the attacker upload a phpshell in any website for my customer, how could i have a fake uname -a for him?
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Apr 10, 2009
I went away from home for a few days, ... Now I am back at home and noticed, that my server is going out with 100% available bandwidth. The server is mainly Http / Ftp / Mail server, so I stopped all services, to see which one it is. ervices stopped, still 100Mbps go out like ants in the flood.
I updated the system, made a backup, installed IPtraf. It seems that I have something 'installed' and my server is running something to attack User computers. It seems to try to find something on random IP's random ports. I am a little bit confused now. As long as my sites are running, I'm ~OK~ but sooner or later I would like to have my bandwidth back. How could I try to hunt down which service/app/process got hacked?
It seems that the monetary system of our society got now more enemy's than friends. Capitalism seems to reach it's end. But my server is serving also ART! Sooner or later we will need to pay copyright even for our thoughts. I was reading today, that the French president wants to punish file sharing as his wife made 3 albums, and wants to get some money ..
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Aug 26, 2009
I want to block some ip address that are attacking my server and making my ssh port busy. On searching the google, I found
Code:
iptables -A INPUT -s ip_address -j DROP
I will add this rule in iptables. My questions are:
1) do I have to do
Code:
chkconfig iptables on
so that it load the iptables at boot. I am wondering why do I need this because iptables is already modified and it loads the iptables at boot time if firewall is enabled.
2) When we add the above rule, which file is modified? Another way, where are this rules stored? It is not in /etc/sysconfig/iptables and /etc/sysconfig/iptables_config.
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