I would like to know if it is possible to deny the access to a file for root? Would ACL's be a possibility? I have "googled" around but haven't found anything interesting (except SELinux). I should secure a password file to an important database.
View 6 RepliesI'm setting up Ubuntu Karmic on my sister's old computer for my nephew, he's quite young so my sister asked to install some content filtering. I'll first setup an OpenDNS account and I've installed and managed to get dansguardian and squid working on a virtual machine to try it out. so far it's working pretty well, but I need to secure it form the inside out.
I was thinking of blocking specific outbound ports so he could not bypass the proxy. because by default the firefox configuration can be easily changed. so I have a couple of questions.
1. is it possible to block outgoing ports on Ubuntu?
2. is that the best method?
3. is there anything else I should be aware of to prevent subversion?
lastly, this question is probably unrelated to this board but I've set up a cron job to update a dynamic ip with OpenDNS, the problem is that the password is in clear text in the user's crontab, can I play with permissions? is it possible to run the job under a root account and deny read/write access to a normal user?
I made a Desktop User account. When I went on that account, it allowed me to execute sudo as if I was an administrator. I don't know what might be causing this. I do have ufw set up and blocking incoming connections. Do you guys know what might be at the root of this?Also, when I used sudo from the user account (which I shouldn't have been able to do), I provided the password for my admin account.
View 9 Replies View RelatedHow to deny download some file types on squid ?
I tried below in my squid.conf
acl blockfiles urlpath_regex -i "/etc/squid/src/blockfiles"
http_access allow localnet freesites !blockfiles
and in my /etc/squid/src/blockfiles
.[Ee][Xx][Ee]$
.[Aa][Vv][Ii]$
.[Mm][Pp][Gg]$
.[Mm][Pp][Ee][Gg]$
.[Mm][Pp]3$
.[Rr][Aa][Rr]$
I still able to download
I have been trying to use my DS2490 USB to serial device with a Maxim .DG1921G thermocron with owfs. It is supposed to give me access to a virtual file system for the thermocrom without needing to launch owfs as root.
Code:
/var/log/messages gives:
Feb 8 16:22:45 norman-HP-G56-Notebook-PC kernel: [ 236.140141] usb 5-1: new full speed USB device using ohci_hcd and address 2[code]....
but if ds2490 module is loaded it works when run sudo.It seems from this that it is a lack of permissions to USB but I have tried all the methods on at http://owfs.org/index.php?page=udev etc. to overcome this and a few others but none work.I am running Ubuntu 10.10 kernel 2.6.35-22-generic #33-Ubuntu SMP
When creating 10 samba users I also created Linux users. I do not want these Samba users to be able to use putty, winscp etc to access the server.
Do you know how I can restrict ssh access to specific users?
I have an ADSL modem and router, its OS is linux. It runs ftp service, and I can read files in its file system, but I have no permission to list files and to write files. It has TR069 protocol connections and can upgrade remotely.It has ssh, but not started.
View 1 Replies View RelatedI created 2nd root (root2) by running useradd -o -u 0 root2 is it possible to deny root2 to change password of original root?
View 11 Replies View Relatedi was hoping that someone in here could possibly help me out with my iptables rule set. First here is what i would like iptables to do, i want iptables to deny all packets or traffic from the outside coming in and for output allow the things i need like web and irc etc... Also, i would like iptables to deny access to all services like sendmail and ssh except i would like localhost to have access to everything. What i mean by localhost is that when i run my iptables script it loads fine except when i try ssh from localhost i get this output:ssh -l user localhostssh_exchange_identification: Connection closed by remote hostI know what most of you are thinking, why do i need to ssh into localhost from localhost just open another terminal, well i am getting myself familiar with iptables i want all services logged and blocked but not from localhost. I cant seem to figure out this problem and i have tried several different things. Here is my iptables script, I am hoping that someone out there can tell me what i am doing wrong...
#!/bin/bash
iptables -v -F;
iptables -v -A INPUT -i lo -j ACCEPT;
[code]....
I just downloaded the DenyHosts2.6python2.5.rpm for deny.hosts from sourceforge and would like to set it up. I normally use fish://, smb:// and ftp:// on the boxes on my lan. I already have files called hosts.allow and hosts.deny in the /etc folder. Will the rpm configure hosts.deny when first run?
View 1 Replies View RelatedI have an Asterisk on an externally hosted vServer with Lenny. In order to further protect the SSH access I intended to change the Port number 22 to something like 55555. For this I changed the /etc/ssh/sshd_config file and restarted ssh. This caused unfortunately the following problems:
(1) The first login works but DenyHost writes now the IP in its list so that the second login with the same IP is blocked.
(2) With RESET_ON_SUCCESS = yes several logins were possible with the same IP, but later it also was blocked for some still unknown reasons.
(3) Files can be uploaded for being edited, but they can't always be saved. When they can't be saved the next login with this IP is blocked. It thus looks like the blocking can occur while being connected. When the files can't be saved it is however still possible to copy files from the computer to the vServer.
I add below the entries in the auth.log from a logout and a login. It shows further how suddenly the attempts to save files were blocked. After this session the IP used for it was blocked. I don't know where the message "Unable to open env file: /etc/default/locale" comes from. If I remember right I had these messages already before. I don't know how much that is really important.
[Code]....
I want to deny access to my server by PC's from other sub LAN on my company, so I will add the lines ALL: xxx.xx.xx. to hosts.allow and ALL: ALL to hosts.deny?
VampirD
Microsoft Windows is like air conditioning
Stops working when you open a window.
-----BEGIN PGP SIGNATURE-----
[Code].....
I am trying to setup a system that will only allow root access to the DVD drive and no other users.
View 8 Replies View RelatedI'm currently running a dual boot (VistaFedora 11) system. I've noticed that the first time I access files on the Windows partition (via Nautilus GUI) I'm prompted for root access. However, on subsequent attempts to access the Windows partition I am NOT prompted for root access (even after I close/re-open Nautilus). My concern is that I'm leaving my root access "open".
View 4 Replies View RelatedI temporarily placed a Back in Time backup into the root partition, by running it as root.However, I couldn't get it back out on the Desktop, so I opened a terminal window and ran 'sudo nautilus', which I now know should be avoided. I couldn't bring up "Properties" of the root folder, but I was able to open it and see the backintime folders. I then clicked on root, which was in the toolbar row "< root backintime" and was able to get full access to properties. I flipped folder access to "create and delete files" for Otherter disconnecting from the network, and moved the folder to the Desktop. So, is this correct or is it inconsistent that I could open root from the toolbar and not from the folder listing when opening 'filesystem'?
View 6 Replies View RelatedI'm having troubles trying to understand this problem:my homeserver until yesterday had a public IP, staying on network, with sshd running and all was fine;this evening I changed the IP, giving it a local lan address, and what happened if I tried to connect to it by ssh?I got an error about "Connection closed by remote host". Google helped me finding that was regarded to hosts.deny file, that was actually containing a lineALL:ALLthat I commented, and all was fine.My question is: why the hosts.deny (that has never changed) was observed only with the local IP?I tried to switch back to the public IP and leaving ALL:ALL, and it did connect without any problem
View 1 Replies View RelatedIf 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?
Here's the issue: from time to time I have to take away my son's access to the internet, so I exclude his laptop from my wireless Linksys router. Works like a charm, or it did until he discovered that my neighbor also has a wireless router, and hasn't secured it.
So my son sits in the corner of the house closest to my neighbor and uses their internet.
Is there any way I can tell his laptop to NOT access a particular router? Or even better, to only access my router?
We need to only allow access to a web page only to some ips. We want to do this via Apache but it seems like the standard way of denying all and allowing some ips doesn't work because we mount a webapp using tomcat.
The sites-enabled file looks like this:
Code:
NameVirtualHost *:443
<VirtualHost *:443>
ServerName web.address.com:443
ErrorLog /var/log/apache2/app_ssl_error.log
[Code]....
I just installed gufw and was in quite a hurry. A root acces prompt came up as I started gufw for the first time, and I quickly responded with appropriate password. All I saw in this hurry was that it had something to do with the usr/share directory.So, here's my question: Does gufw require root access when first starting up
View 6 Replies View RelatedI get the problem to acess root password when i am in user login, means wahen i am in user login and want to install software from terminal then he asked root password, when i supplied root password but he give me login incorrect.
View 2 Replies View RelatedI could not find any where the documentation the only best which I got was [URL]
My question is the following blog says to remove an IP from /etc/hosts.deny which denyhost has blocked
[URL] you need to have a directory /usr/share/denyhosts/data I do not find any such directory
Also when I tried to check tcp wrapper configuration as given here
[URL]
tcpdchk -v Cannot find your inetd.conf or tlid.conf file. Please specify its location.
what does the above output mean? How do I make sure denyhosts is doing its job?
I have tried to not allow root access and have created a wheel user.
Now I can not logged in as root.
Its okay but when am logging as wheel user and trying to access root then it says:
Code:
I just set up denyhosts and it worked properly the first time adding lots of ips to the hosts.deny.I then set it to run every 12 hours noon and midnight.I wanted to see if ran properly and I got all this.Does it look like its working?
Code:
May 15 12:00:01 hyrule CRON[14286]: (root) CMD (python /usr/share/denyhosts/denyhosts_ctl.py -c /usr/share/denyhosts/denyhosts.cfg )
[code]...
I have a question, on my firewall at work I am seeing a constant flow of denies from many different source IP addresses, of tcp/udp destination port 53372 & 53375.What in the world is that, and why these two ports over and over
View 1 Replies View RelatedI am using denyhosts on a server so in a config file/etc/denyhosts.confthe following value is setQuote:DENY_THRESHOLD_INVALID = 3which as per their configuration file saysQuote:
DENY_THRESHOLD_INVALID: block each host after the number of failed login
# attempts has exceeded this value. This value applies to invalid
# user login attempts (eg. non-existent user accounts)
[code]...
running Karmic 9.10 found weird file in root directory
ls -l returns
rnet@rnet-desktop:/$ ls -l
total 100
[code]...
I am interested in making the root file system is read-only. I've moved /var and /tmp file systems to another partitions. There are two files in the /etc directory that need to be writable.
These are:
I've moved this files to /var and linked it. I've added command to the /etc/rc.d/rc.local file:
That's it. Are there other solutions to make the root file system is read-only?
If there is a general NFS share in the LAN and for example this share has three files - a, b, c is there any way to restrict file access to the root user of one particular host(falcon) in the same LAN environment while the normal users from the same host(falcon) should be able to access the NFS share & files a, b, c.
View 1 Replies View RelatedI need to customize linux kernel root file system for embedded linux system. During compile time, for root file system I am able to create different user/group ex: "gnumuzic/Muzic". But I want to give access to group "Muzic" to some folders like /dev/nexig during compile time.
View 1 Replies View Related