Fedora Security :: Blocking And Allowing IP Address For FTP?
Jul 15, 2010
I want to ask about securing the FTP connection... I have one server that Installed with Redhat Linux Fedora 6.
And now, i want to securing the FTP access, so only the selected IP will be allowed to connect. Do anyone know how to do this?
Another thing is, my server using Webmin 1.3 to manage the server and there not installed / not configured yet with Frox FTP, ProFTPD Server, WU-FTP Server... even there is such thing in my Webmin...
Can i make use one of the three FTP i mention above, and if yes, will it be affecting the current FTP access?
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Dec 31, 2010
I'm assuming that the following should block the complete 178.123.xxx.xxx address range.
Code:
iptables -I INPUT -s 178.123.0.0/24 -j DROP
Then I believe that I need to save this change.
Code:
service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
However, I'm not so sure that it is actually working based on the fact that there continues to be access to my wiki from that address range. The following is after I made the firewall change.
Quote:
178.123.177.61 - - [31/Dec/2010:04:24:40 -0500] "GET /mywiki/Opera%20Web%20Browser?action=edit&editor=text HTTP/1.1" 200 6346 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"
code....
Let me state that I'm new at this iptables thing. I did some reading and decided that I need to make the above change to the firewall but it doesn't seem to make a difference.
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May 8, 2010
I would like to COMPLETELY block a specific IP address using iptables. I found this one:
Code:
iptables -A INPUT -p tcp -s xxx.xxx.xxx.xxx -j REJECT --reject-with tcp-reset
Will this work? How do I undo the changes later?
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Mar 30, 2009
I am setting up a iptables firewall on one of our servers, and I would like to block a range of addresses from getting into the system. I am using a script that does a BLACKIN and BLACKOUT methodology for specific addresses. One example is the following:
Code:
$IPTABLES -A BLACKIN -s 202.109.114.147 -j DROP
...
$IPTABLES -A BLACKOUT -d 202.109.114.117 -j DROP
What would be the correct syntax to use if I wanted to block an entire remote subnet from getting into the server?
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Sep 4, 2009
I hv Cent OS 5.3 installed as server. I hv a network of approx 100 desktops and laptops. For a security purpose i want to block certain laptops from gaining a the network access using dhcp. Can we block the ip address leasing if a specific MAC address request for a ip lease?
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Dec 8, 2009
i've got a few questions about iptables. i know how to set up ip tables to only allow from an ip address or a subnetting ip addresses. question is how do i allow from 2 different networks? would i need to create 2 lines of entry in iptables to the same port? e: allow 10.168.1.1 and 196.168.1.1 on port 22 is there a way to put all that in 1 line or would i need to create to rules for the port? i know i can use the ssh allow or deny but i'd like to stop access even before it gets to the ssh. stop it at the source kinda thing.
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Jul 8, 2009
I am running Fedora 11 and every time i plug in my iPod it tells me... SELinux is preventing mkdir (podsleuth_t) "read" security_t ... I have no idea on how to create a policy module to allow access.
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Apr 14, 2010
In fedora 12 how can i configure the system such that a particular user can browse only selected web sites.
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Aug 8, 2011
since I upgraded to F15 I noticed that "su -l" is very slow, it takes about 20sec before it gives the prompt. I traced it down to a problem with "xauth" as su asks for the authorization for the display running "xauth nlist :0" which times out with an error. Actually, the command "xauth nlist :0" by itself gives:
xauth: timeout in locking authority file /home/user/.kde/tmp-host.domain/xauth-200-_0
If I put SELinux in permissive mode both command work without problem so I suppose SEL is the problem. I checked the permissions and settings of the file which is "unconfined_u:object_r:config_home_t:s0" but I have no idea if this is the right value, running "restorecon" on the file, directory or the whole /home/user didn't change anything.
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Mar 15, 2009
SElinux is blocking my internet connection and every time when I connect t the internet (pppoe connection) I ge message.
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Mar 6, 2010
I'm trying to setup ssh access on my Fedora 12 laptop. I get the following error message in /var/log/secure when I try to login from another machine using ssh and the login is denied:
Code:
sshd[3025]: error: Could not get shadow information for <user>
sshd[3025]: Failed password for <user> from <ip> port <port> ssh2
If I do a 'setenforce 0' I can login and no error is logged.
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May 25, 2011
Tried google and searching this forum to no avail. Under Fedora 14, there is an selinux policy which blocks sshd from making outbound connections on port 80 or 443. This can occur when a client box tries to tunnel through the ssh connection for encrypted access to the web.
While I did manage to allow this happen by creating a permissive domain for sshd with this command:
Code:
The preferred way would be to allow sshd to make connection on other ports with a similar command that does not seem to work:
Code:
Is this the correct way of allowing an outbound port connection for the sshd daemon?
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Feb 4, 2011
How to block an ip address from mikrotik so that when a fake user use this ip he doesn't get internet but in the mean time real user gets internet. Real user will not harm if fake user trying to access.
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Apr 6, 2011
I need to block mac address in my network then i foolowed as below acl's but am getting output as follows I tried as in /etc/squid/squid.conf acl block arp aa:aa:yy:yy:xx:xx http_access deny block but it give me error as like: - (This is the output of # squid -k parse) aclParseAclLine: Invalid ACL type 'arp' FATAL: Bungled squid.conf line 1234: acl block arp aa:aa:yy:yy:xx:xx squid Cache (Version 2.5.STABLE6): Terminated abnormally.
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Jun 18, 2010
I have one server that has Asterisk running.On front of that, I use DD-WRT router as gateway. As I have checked the log files, I saw that there is a specific IP Address that is continuously accessing the application and trying to authenticate to SIP with a series of extensions. This is like DoS attack for SIP. What I did was to block/drop the IP in DD-WRT using the iptables. I can see from the /proc/net/ip_conntrack that it is being "UNREPLIED". But my concern is that does it still uses a lot of bandwidth even though it is already being blocked?
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Jun 29, 2011
I have UBUNTU server 10.04 LTS with 3 NIC "eth0" local and eth1,2 as internet connection and it acts as firewall, http proxy and samba file server ,I installed Zentyal panel manager for my server for easier management I did not configure any specific rule for my firewall but I have some problem with my clients who wants to connect to my server as gateway or as file server even my self experienced these problems too. these problems are as follow:
1. some time for a few minutes (maximum 10 minutes) my server block some of my clients to access it or internet but just for minutes but it is very annoying.
2. all of my clients those who login to an https servers or login to their mail or those who has some software like team viewer say that they are logging out from their session randomly I mean some of them logging out from their mail(yahoomail or googlemail ) or disconnecting from teamviewer connection or as I saw team viewer disconnecting for a few seconds and then comes back again. but I did not set any thing in my firewall or other services. this is my complete iptable rules:
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Feb 2, 2010
Hope you can help me out. I'm trying to setup a "drop-box" on ubuntu 9.10 server with vsftpd. I'm able to login and land in the /home/user directory, however I cannot write anything.
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Sep 5, 2010
I've got two virtual machines running, the first VM (VM1) has two network interfaces, one bridged with my real lan, one a private subnet. The second VM (VM2) has one nic, only on the private subnet.
I have VM1 acting as a router for VM2, giving access to my real lan for internet access. The problem I'm having is I cannot get VM1 to forward ports 80 (http) or 222 (ssh) to VM2 from my real lan.
Here is the script I've cobbled together from various (foreshadowing!) locations:
Code:
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Feb 23, 2010
If I allow, my server's IP is:
11.11.11.11
If I allow 11.11.11.11, and block 22.22.22.22
22.22.22.22 can't access the server
But if I allow 11.11.11.0/24, and block 22.22.22.22
22.22.22.22 can still access the server!!
Does anyone know why that is?
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Sep 11, 2010
I am using dyndns to keep track of my smartphone's ip address. The idea is to be able to ssh into my home network, protected by an iptables firewall. If I use the command: # iptables -I INPUT 9 -s myname.dyndns.org -p tcp -m tcp --dport 22 -j ACCEPT it updates using the current ip address, but the next time I get an ip address update to my phone and update dyndns to properly provide nslookups, this is not being updated in iptables unless I restart my firewall. Is there a better way to do this?
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Feb 19, 2010
According to this article -- [URL] there are problems with FireFox security, as a veriety of Zeus is being used by crackers in Europe and China. Allowing for alarmist reporting, this still looks unpleasant. Does anyone have definitive information about how this attack affects the various operating systems?
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Sep 14, 2009
Im an academic (university networks and security lecturer) studying/teaching network and operating system security, and inspired by the work of Hovav Shacham set about testing ASLR on linux. Principley I did this by performing a brute force buffer overflow attack on Fedora 10 and Ubuntu 9. I did this by writting a little concurrent server daemon which accidently on purpose didnt do bounds checking.
I then wrote a client to send it a malicious string brute forcing guessed addresses which caused a return-to-libc to the function usleep with a parameter of 16m causing a delay of 16 seconds as laid out in [URL] Once I hit the delay I new I had found the function and could calculate delta_mmap allowing me to create a standard chained ret-to-libc attack. All of that works fine. However .... To complete my understanding I am trying establish where I can find the standard base address for ubuntu 9 (and other distros) for the following, taken from Shacham:-
Quote:
[code]....
/proc/uid/maps gives me some information but not the base address ldd also gives me the randomised starting address for sections in the user address space but neither gives me the base address. Intrestingly ... when a run ldd with aslr on for over (about) 100 times and checked the start point of libc I determined that the last 3 (least significant) hex digits were always 0's and the fist 4 (most significant) where between 0xB7D7 and 0xB7F9. To me this indicated that bits 22-31 were fixed and bits 12-21 were randomized with bits 11-0 fixed. Although even that doesnt define the boundaries observed correctly.
Note: I am replicating the attack to provide signatures to detect it using IDS, and for teaching purposes. I am NOT a hacker and if needed to could reply from my .ac.uk email address as verification.
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Feb 21, 2011
i am relatively new to ubuntu. Just recenty i have not been able to access certain files(for example the history and bookmarks in the firefox folder), download files individually from the internet(music,fonts,etc), recieving an error message
Quote: Originally Posted by firefox error console
Error: [Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIFileOutputStream.init]" nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)" location: "JS frame :: file:///usr/lib/firefox-3.6.13/components/nsSessionStore.js :: sss_writeFile :: line 2944" data: no][code]...
i have sudo priveleges and can install via update manager. i read somewhere that compizfusion might affect access permissions and i do use compiz and emerald at the same time.
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Oct 16, 2009
I'm behind a modem router with firewall and SElinux enabled by default - but checking my mail this morning I noticed several ' delivery failures ' ( allegedly ) from hotmail referring to mail I hadn't sent. When I checked the spam folder for the on-line side of my mail account there were more failure notices. Two points that may be relevant, one is the recent Hotmail exploit, the other is that this only occurred with the address I use for railway matters, and some people cc to everybody, so it's odds on that address is on a good few computers. On one occassion when I checked my spam folder on-line I found spam which claimed to be from myself, so I know the ' send ' address can be spoofed, is this the explanation, or is it a new kind of attack linked to the Hotmail exploit?
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Jul 27, 2011
I recently set up a web server at home, using a non-standard port, due to my ISP blocking 80. I just checked my log files, and I see a TON of entries indicating that a file was not found "proxy-1.php", "proxyheader.php", etc. I do not have these files, not intend to have them as part of my website. I did a whois looking by IP address for several of these, and they all seem to come from an ISP in China. Is there a way to BLOCK any IP address outside the US (that is somewhat simple to do?)
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Mar 26, 2010
I can see what Firestarter is blocking in the Firestarter/Events tab, but after reading all the man pages of UFW, I still don't know how to check what the UFW is blocking.
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Apr 1, 2010
After reading a lot about networking and security I decided to check the security of my own ubuntu box. So I went installing Nmap and discovered that port 139 was "open". Since I 'd read how to use ufw I created a deny rule for port 139. After a second scan with Nmap it still said that port 139 was open as shown below.
[Code]...
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Mar 8, 2011
im having a bit of a problem with Firestarter, i have Transmission opened and i am downloading a movie but when i check Firestarter i see hundreds and hundreds of Ip's that are blocked, and like 10ip's every second that get blocked.
[Code].....
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Apr 15, 2011
I have the default to deny all. The only rule I have in there is:
Code:
To Action From
-- ------ ----
[code]....
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Aug 1, 2011
I might be misunderstanding the log but it looks like UFW is blocking connections. I want to allow all incoming and outgoing. I guess what I'm saying is that the servers on my computer will open ports but all other ports should respond with closed just like a default Ubuntu install. Trying to use UFW to monitor connections without really doing any firewalling.
Code:
Aug 1 07:14:07 universal-mechanism kernel: [311111.963762] [UFW BLOCK] IN=eth0 OUT= MAC=00:1f:c6:8a:e9:66:00:01:5c:32:f4:c1:08:00 SRC=72.21.203.146 DST=174.44.178.56 LEN=40 TOS=0x00 PREC=0x00 TTL=233 ID=51984 DF PROTO=TCP SPT=80 DPT=54466 WINDOW=8201 RES=0x00 RST URGP=0
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