I want to create a tunnel from my home computer to a linux server by SSH, then i can use the tunnel as a tcp forwarding proxy(SOCK 5) to access the web via the linux server. But i got "Internet Explorer cannot display the webpage" on my home computer, and when i check the "/var/log/secure" in the linux server(fedora), I found: "sshd[17926]: error: connect to xx.xx.xx.xx port 80 failed: Permission denied"
View 14 RepliesAs it stands I have a small home network operating behind my modem/router. Some of the ports on this are forwarded to my PS3 for gaming but I was looking at forward some for my file server.
At the moment I've forwarded port xxx22 to port 22 on my server for SSH for instance. ANd similarly 21 for FTP (although it doesnt seem to want to connect for any more than a few seconds using that). What I was thinking of doing was placing a small website for a handful of ppl to use on the server too and port forward again - xxx80 to 80. It works just fine but I'm a little concerned on the security front.
As I've moved the port to something different from the outside world I'm presuming I will have already cut the potential for malicious folks to wander in but is there anything else I should be doing? At the moment there's no firewall operating on the server, usually as its hidden behind the modem/router. But if I open this thign up more permanently what should I be doing? I've read a few articles on it but I'm always left with the overwhelming thought of "Thats if theres no firewall in my router" as they just seem to do the same.
I also had ever tried all methods they mentioned, but my problem is still there. I am using a MAC OS X 10.6 ssh a remote redhat server. I hope to see X of redhat on my own MAC. Below is what I've done: 'MAC_ip' stands for my mac; 'redhat_ip' stands for redhat server.
1) ssh to redhat server
2) change to root
3) type command: DISPLAY=MAC_ip:0.0
4) type command: export
5) Back to MAC
6) change to root
7) type command: xhost +Redhat_ip
8) vim /etc/ssh_config, add X11Forwarding yes
9) Back to redhat, type: xclock
I got below message: Error: Can't open display: MAC_ip:0.0 I also tried some methods to login as others suggested:
[Code]....
Up to now I've been playing with Ubuntu whilst storing important data elsewhere for about 2 years. Now I'm ready to move to Ubuntu completely but want to address my security.I'm currently using a desktop and server behind a hardware firewall / Internet router. The router has DynDNS and forwards port 80 to the webserver and a port I picked at random to the desktop 22 for SSH with private keys. SSH passwords are disabled.
The first question is, is there a danger of running different security levels on the two machines? I don't care about the server, there is no data on it so I currently forward port 80 and am considering forwarding ports 631 (CUPS) and a port for LDAP. Will this effect my desktop (which has info I don't want to loose).The next question is whether port forwarding / hardware firewall is actually a safeguard against attack.
I'm trying to SSH into my home computer from a remote location outside of my house's LAN and can't figure out remote port fowarding.
The guide here says to use the following:
Code:
I've tried connecting to my home computer through many combinations of the syntax listed above, read the man file, and looked online for help. But can't find out the proper syntax or a good guide that isn't written for Windows users using Putty.
Let's assume for the sake of simplicity that the public IP address of my home SSH server is 123.123.123.123, the private IP address of my home SSH server is 192.168.1.100, my home SSH port is 2222, and the SSH port at my current location is is 22. How would I write out the command?
Every time I try to connect I get a "connection times out" error.
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:
If I forward port 5764 to port 80 to my VOIP device, I can nmap and get a proper connection. If I forward port 5764 to port 22 to my server, it comes up filtered. It even happens if I try forwarding port 80 to my server. So I'm sure it has something to do with my server, but I'm not sure.Here's my Linksys iptables:
Code:
:wanin - [0:0]
-A FORWARD -i vlan1 -j wanin
[code]....
This morning I was looking at the router's log file and noticed a certain IP address was able to gain LAN access on port 2222. That just happens to be the port my SSH server is listening on! A whois search revealed that IP address is in Germany. As soon as I found this out I stopped forwarding all ports to this machine in my router.
how to tell what had happened, what information this person was able to obtain, and if he left any goodies behind that could hurt me? I've read through some of the logs on my computer and haven't been able to find much at all. I did have some personal information on the hard drives, but that information is encrypted. I'm thinking if they were able to get my SSH password then that information probably isn't safe either (assuming they have some of it).
went through the tutorial on FedoraSolved for securing ssh. I installed denyhosts with yum and then tried to run it with the command line command"sudo /etc/init.d/denyhosts start" but I got the message"Job Failed. See system logs and 'systemctl status' for details [FAILED]"and in the application "services" in the applications menu,t shows an exclamation warning and says that "This unit has failed"
View 1 Replies View RelatedI'm trying to write an iptables config file, but got stuck.So I want to define an IP range that allows full access eth0-eth1 forwarding, and another that is allowed to access some special ip-s. The first part works, I could make the range has full access:
iptables -A FORWARD -m iprange --src-range 192.168.80.20-192.168.80.40 -j ACCEPT
iptables -A FORWARD -i eth1 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -o eth1 -i eth0 -j ACCEPT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
But cant find out, how tom make the second rule. How could I put speicified target ip-s in this? I've tried to make a new chain:
[Code]...
I'm having a mare with SSL with Apache. I have set it up and if I go to the follwoing address http://192.168.1.2 it seems to work and the pages are delivered to my browser. However if I try to access it from an exernal PC it will not work.
I can get to the non-ssl part of the site so the static ip is resolved and the port forwarding all works.
Does any one have any ideas (and in fact i think I may have just solved it - Ports - 80 mis open but I haven't done anything with 443. Will check it out and post back.
I tried to make "ssh tunneling", but failed and got this message.
Quote:
Administrator@windstory-PC /
$ ssh -R 7869:localhost:7869 windowsstudy@192.168.0.4
windowsstudy@192.168.0.4's password:
Warning: remote port forwarding failed for listen port 7869 Last login: Wed Jul 21 01:56:04 2010 from 192.168.0.2 -bash-3.2$
1. system environment
192.168.0.2 - windows 7 + copssh
192.168.0.4 - centos 5.4 x86 + openssh
2. Guide for setting "ssh tunneling"
[URL]
3. Added this to sshd.conf
Quote:
AllowTcpForwarding yes
4. "netstat -na|grep 7869" at 192.168.0.4
Quote:
[root:maestro:~]# netstat -na|grep 7869
tcp 0 0 0.0.0.0:7869 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:7869 127.0.0.1:53539 ESTABLISHED
[code]....
5. result of "ssh -vvv -R 7869:localhost:7869 windowsstudy@192.168.0.4"
Quote:
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
[code]....
6. I added 7869 for telnet service as follow;
Quote:
mytelnet 7869/tcp # My Telnet server
When I use the following command:
ssh user@ssh_server -L 5500:localhost:5500 -p 22
everything works fine. I can log in, and local port forwarding is done. Otherwise when I use the command:
ssh user@ssh_server -R 5500:localhost:5500 -p 22
I get an error "remote port forwarding failed for listen port 5500". However when I try remote port forwarding in WinXP by use of putty there is no problem...
I am trying to get kerberos ticket forwarding via SSH to work between RHEL and Ubuntu. It is working, when connecting from Ubuntu to RHEL, but not the other way round. (It also works between RHEL machines.) I have enabled the GSSAPI features in both SSH client and server, checked keytabs and verified, that my ticket is forwardable.
Any idea, how to get more information? Could it have s. th. to do with using allow_weak_crypto=yes in our krb5.conf? I have to use that, because our kerberos server only supports DES encryption.
sudo ssh -L 750:192.168.123.103:873 username@192.168.123.103It does exactly what it's supposed to do, but how do i edit / remove this rule?Is there some config file where i can alter the forwarding? How does it get stored?Im using Ubuntu 10.10Server Edition (allthough i recon it would be pretty much the same across all versions
View 5 Replies View RelatedI'll explain this in one sentence: Is it possible to program a port-binding shellcode in which people across the Internet can connect to, without being thwarted by the router blocking their data because the port its bound to doesn't allow port-forwarding
View 2 Replies View RelatedI have just set up shorewall on my router running Arch Linux. The external network is on eth0 and the internal network on eth1.I have set it up for masquerading and that works fine and I can open ports to the firewall. But I'm having trouble with port forwarding to my internal machines.The problem I have is that when port 22350 is forwarded to 192.168.1.3 on my local network, checking the port with nmap from a remote computer gives me:
Code:
PORT STATE SERVICE
22350/tcp closed unknown
[code]....
I just installed FC12 and was trying to do the security update, but it encountered an "internal error" and asked me to "report this bug to the distribution's bugtracker" with the details. However, I am not sure exactly what to do. Could someone be kind enough to let me know?
View 1 Replies View RelatedI don't know why but my server is no longer successfully updating its security repositories when I run 'apt-get update' on my system.Some index files failed to download, they have been ignored, or old ones used instead.Did I mess something up? No changes have been made to the server and I ran 'apt-get clean' and that didn't really do much.
View 2 Replies View RelatedHow do I monitor who is ssh'ing into a box (SLES) as well as failed attempts? How can I log their IP addresses, even if they're not in DNS?/var/log/messages I see their hostname but no IP address
View 13 Replies View RelatedI'm running 11.04 (64 bit) get the following in my syslog
[Code]....
1) Why is this happening
2) How can it be fixed
3) How can it be avoided
Im using CenOs 5 and have install a mail system(postfix+dovecot),when I trying to enable selinux for enforcing mode and i'm have some issue, the user authentication failed. How can i to fix this problem?
View 2 Replies View RelatedDoes anyone know a method for setting the timeout period for failed logins on Linux RHEL5.x systems? Linux docs say to set the failed login delay paramter in /etc/login.defs to the desired seconds. I did this, but the settings have no effect, ie weather set to 2,4,10, etc, the actuall failed login timeout period(which I verified with a stopwatch), never changes.
View 1 Replies View RelatedI have intalled RADIUS server on one machine which has fedora 10. I have installed freeradius-server-2.1.10 on it(server machine IP 10.150.110.42).
I have one more machine with redhat linux on which i have installed pam_radius-1.3.17(client machine IP 10.150.113.4).
I have done the follwoing configuration at both sides
SERVER SIDE.
users file
"vijay" Auth-Type := Local, Cleartext-Password == "123qwe", NAS-IP-Address == "10.150.113.4"
Reply-Message = "Hello, %u"
[Code]....
Above mentioned is my configuration. when i try to connect client with SSH it is not sending a request for authenticating user to RADIUS server. what else configuration i have to do, or if there are any mistakes in my configuration
how to block any IP address who failed to connect more than 3 ssh?
View 5 Replies View RelatedI was playing around with a script that seems to work relatively for my needs when SSH comms fail - AKA a user or someone attacking. This works. But, how would I add a threshold value? lets say if there are 3 entries, then perform add the IP to iptables as a rule.
Code:
#!/bin/sh
#
# FIREWALL SCRIPT
#
# March 1st, 2011
#
# Purpose:
# Add offending IP from failed SSH connections
# to the iptables (firewall) rules.
#
## Vars:
TIMETHRESHOLD="10" .....
How does one unlock an account when it is locked by too many failed attempts for login?
View 1 Replies View RelatedI have been trying to get pam_tally2 to block failed logins with ssh. No matter how many failed logins I do I can still log in with the correct password using SSH. Anyone have this working?
Here are the configuration I am using. I have put this in sshd and password-auth-ac.
auth required pam_tally2.so deny=3 file=/var/log/tallylog lock_time=180 unlock_time=1200 magic_root account required pam_tally2.so magic_root In the /var/log/secure I do see messages related pam_tally2 and the counter going up.
I'm trying to lock an account after a number of failed login attempts in a RHEL5.
This is the relevant configuration in /etc/pam.d/system-auth
In the logs I can see how the count of failed logins increase and exceeds my deny option but the account isn't locked
Do I need any other option in the PAM file? Is there any other way to lock an account?
I keep getting hundreds of SSH failed logins per day. Is there a way with iptables, i can say if a user connects too to port 22 over 8 times in 10 minuntes, then block them for an hour?
View 7 Replies View Related