Security :: Setting File Permissions For File /var/log/Xorg.0.log?
Jul 7, 2009
i am trying to set the file permissions for the log files "/var/log/Xorg.0.log" and "/var/log/gdm/:0.log". These files seem to be created when a user logs into a whokstation (my guess so far). I am trying to comply with a security mandate that all log files in the directory /var/log are set to 0640. The two mentioned files always seem to have the permissions 0644, does anyone know where and when these filea are created and how I might set the permissions when the files are created
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Jan 6, 2011
I have system at work I am setting up that runs on linux, it was powered up back in september but we didn't get the details to configure until this week, unfortunatly var filled up with 100% spaced used due to a log file that keeps being written to until its intizilized, I can't just delete the file so (will not be recreated), I pulled it off and took it home and split it into a smaller file (from 740mb down to a 15mb chunk)I'm really just a linux newbie so can someone explain to me what the permissions are on the current file and then what chmod would make smaller file the same. clusternet.log is the orginal and clusternet1.log is the one i made from split. I know its read, write and execute (whats the r write after x on clusternet.log?) but I'm not sure on what it means in the position its in, the clusternet.log should have permissions only for root correct?
Code:
-rw-r--r-- 1 luke luke 16613376 2011-01-06 20:10 clusternet1.log
-rwxr----- 1 luke luke 740130816 2011-01-06 06:39 clusternet.log
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Mar 29, 2010
I am trying to set up a permanent resolution in the xorg.conf file. At the moment whenever I reboot the machine the resolution defaults to auto. How I can change that to be constantly at 1600x1200?
Here is my xorg.conf file.
Code: # nvidia-xconfig: version 1.0 (buildmeister@builder62)
Wed May 27 01:58:49 PDT 2009
Section "ServerLayout"
Identifier "Layout"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
InputDevice "stylus" "SendCoreEvents" # Added
InputDevice "eraser" "SendCoreEvents" # Added
InputDevice "cursor" "SendCoreEvents" # Added
InputDevice "pad" "SendCoreEvents"
EndSection .....
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Jun 29, 2009
Is there a Linux HOWTO for setting the xorg.conf file and installing drivers?
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Jun 26, 2011
I have a file server running a cronjob to reset file permissions on a regular basis. I was thinking, I wonder if there is a way to do the chmod and chown command in a single command, as I always have to do both on the same folder, the way that you can do "chown root:users Uploads" instead of having to do two separate commands for chown and chgrp.
Then I got to thinking, are these commands even necessary? Every file copied or moved into these folders by any user needs to be something like "chmod 750" and "chgrp root:users", so rather than running a cronjob to do these modifications at regular intervals, there ought to be a way to set the folder permissions so that any files contained within will have these permissions.
The problem arises because users create documents, then a supervisor with elevated privileges can move those documents into a shared folder, however the permissions are wrong, they are user1:user1 for the owner and group and the other users can't read the file until a cronjob changes the group to be users. This has actually been acceptable, but certainly there is a better way to do this.
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Sep 1, 2011
2 computers, Ubuntu 10.04 and Ubuntu 8.04. I have 2 folders named In and Out. Out I have set up on 10.04 for guest use. I am able to transfer files to 8.04 from that folder. Trying to set up In for a specific user to modify files. This requires a login. Both computers have the same user name and both have the same password. I set the file permissions automatically from 10.04 when electing to share In for allowed modiying. When trying to access In using 8.04, a password request window is generated with the user name already showing, and the domain name filled in as "Workgroup". The user name that shows is my login name, by the way.
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Jan 25, 2010
I have two NFS mounted dirs that the users want specific permissions set upon creation of dirs/files, independent from any other machine on the network.
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Jul 23, 2010
When setting up NFS what type of Linux file and directory permissions should you be familiar with?
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Jun 23, 2010
I want to copy a file into my Root folder but I cant.what should I do?
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Sep 12, 2009
Is there a way to specify append only permissions for a file?
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Mar 3, 2010
I am setting up a new ubuntu server, and I am quite new to linux. This server will be used as code repository for a project I am going to be working on. I plan to setup 3 groups for users: dev, test, doc
- for various developers, testers and documentation users.
I would like to setup the following permissions on the main code repository directory:
dev - write permission
test - execute permission
doc - read permission
public (anyone outside these groups) - deny all access
I am unsure what chmod setting to use, or if this is even possible in ubuntu.
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Mar 24, 2011
How is possible, that vim can write to file and changes his ownerchip ?
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Jul 6, 2011
I know how to assign file permissions and other tasks like user to group, but I'm stuck with a situation in how I should set up my system.So I have a LAMP server set up. I'm not the only developer so I created a group called "developers" for my other users "Mike," "Alex," and "Cindy," which are developers (I'm Mike by the way). I know that "www-data" is the user and group Apache uses.This is good because only I have permission to update the production site, but for the dev site, it's a different story.
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May 14, 2010
Does anyone know why files in /boot are world-readable (particularly the initial ram disk)? I'm not an expert, but I would not expect anyone except root or a sudoer to have the ability to read these files.
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Feb 5, 2010
What do the default file permissions in ubuntu 9.10 protect/deny access to?
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May 9, 2010
I have broken my MBR and can now only enter 9.10 with the ubuntu start up cd.when i boot through he ubuntu live cd.I can see my mounted drive with all my files however i do not have the permissions to open or copy some of my files( music, films, pics) . id like to do this so i can transfer all my files to an external HDD and reformat start all over again.error when trying to open files.You do not have the permissions necessary to view the contents of.
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Jul 23, 2009
Picture the following:On computer A, local user John (and John alone) has rwx access to file1.txtComputer B also has a local user account named John. If file1.txt was to be copied from computer A to computer B, would the user account John on computer B be able to access it?I guess this wouldn't work using two windows computers due to the User name / GUID relationship. Maybe linux has something similar?
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Oct 3, 2010
In Nautilus I select a directory on local NTFS volume. I'm logged in as root, right-click > Properties > Permissions and I set "Others" to "none". But it doesn't work. I want my friends & visitors to use and enjoy Ubuntu but without access to my NTFS volumes.
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Jan 25, 2011
Is anyone aware of a detailed "flow chart" -- arrows and decision diamonds, etc -- that describes the file access and permissions processing? I would love to see that diagram. Years ago on a platform far away (Digitial VAX/VMS) their manuals had such a flow chart that covered not only the user-group-owner and read-write-execute permissions decision making but also include "access control list" processing at a superficial level. If someone has access to the VAX/VMS flow chart, that might be a start toward sorting what linux does.
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Jan 28, 2010
I was curious if anyone has addressed this issue before. I have set the permissions to /var/log/Xorg.0.log as follows:
Code:
-rw-r----- 1 root root 00000 Jan 00 00:00 /var/log/Xorg.0.log
I have done a lsof and the file is being opened by root. I have set Roots umask to 0077, yet after a reboot
[code]....
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Feb 24, 2011
However, configured a website on a dedicated server using WHM/cPanel. The site was uploaded using the master account for the website.
The security issue is public users are able to upload files on to my server via the website. They could even access the root and execute whatever they want on the server.
I have consulted with 2-3 Linux experts. According to them, the PHP user has rights to execute anything on the server or upload & store files in whichever folder they want.
Can I protect my folders to avoid file uploads via the website. The application has security vulnerabilites. However, I want to prevent hackers to enter my site until the vulnerabilities are fixed.
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Nov 2, 2010
I have a remote directory shared over NFS called tech with perms set as 0750 and owner set to root:tech. I have 2 groups: tech, and techAdmin. tech can read and execute within tech/. techAdmin can read, write, execute. I have 4 users: user1, user2, user3, user4. user1 and user2 is a member of techAdmin, user3 and user4 are members of tech. simple so far...but wait here's the problem. If user1 creates a file inside tech, user2 cant read or modify it because user1 owns it. Here's a few sites that reference this problem:
[code]....
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Mar 16, 2011
I am trying to lock down a server using audit.rules. I intend to use ausearch to review certain entries from time to time. I noticed that it's possible to assign a "key" to each rule and then use `ausearch -k` to show only the records that have that key.Unfortunately, the key feature seems broken. I started with the following rule in audit.rules:
Code:
-a always,exit -F arch=b64 -S open -S openat -F exit=-EACCES -k deny
I do a `cat /etc/shadow` and a `ausearch -ts today -k deny` and it seems all went well.
[code]....
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Dec 10, 2010
Some time back using this computer a SucKit rootkit was found. Having dd urandomed the drive, flattened CMOS battery, flashed BIOS, run Knoppix live CD 6.1,using no flat pack battery (laptop), and memtested the RAM, I am still having problems with what I suspect is a javascript file that tries to reload the rootkit from? firmware. I suspect the firmware as everything else should have eradicated it??
Also it or a hacker via a backdoor then corrupts the drivers so devices malfunction. Windows security programs and rootkit detectors don't seem to pick it up. Fresh install of Windows or linux after the above still show this problem, though internet not used. The person who admitted rootkitting this machine is capable of writing java programs or using javascripts to do all this.
When viewed using Ubuntu 8.4 files and dates on a Windows partition appear normal both in file manager and terminal. However booting using Knoppix CD these files are all green, and I cannot change their permissions, even as root. ie: everything is green including text files etc. If I copy them to a linux partition, I can change their permissions and make them nonexecutable and nonwritable. Also on the Windows FAT32 partition the . directory has the date 1 Jan 1970.
If I disable any green files, I can shutdown and reboot cleanly. If I don't I start having problems shutting down [/usr/sbin/init ?] And always these follow a pattern:
Can't remember details as I have now corralled the beast but error messages relating to:
nfs-server
inet.d/statd
are the start of these.
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Nov 26, 2010
We are a school and we share a samba folder with students and teacher groups. What we are trying to do is:
- Give students group users the permissions to rwx own files in folder
- Students must not be able to do anything with others files. I mean nothing so, at most, they could see the files in folder but not read it.
- Teachers can do anything with files in folder
As you can imagine, the idea is that students deliver their exams in that folder without the ability to read/copy the other students files. With sticky bit we can restrict students permissions to their own files, that is ok, but how to restrict all the permissions on other students files without restricting student access to that folder?
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Mar 19, 2010
I wanna make a small web server for local use , I've installed apache, every thing works fine I'm the root
I wanna protect the folder that contain the htdocs files (www), i don't want any users that not in root group to access (not even read)
I changed the permission of the htdocs folder as next
Owner: www (apache user)
per: creat , delete
group: root
per: creat , delete
other: none
it only works on the main folder that i changed its permissions ! not all sub folders and files ! were my steps right ? and are their anyway to change all folders and files at once ?
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Feb 23, 2010
one thing i can't seem to be able to do is give the guest account just these permissions: using firefox (or other browser) and using one file directory and using a text editor. means the guest can browse the net and sefe some infos form that - nothing more. the previous version had something like that, it was really easy for me, a noob, to do it with two or three clicks. if this possibiility exists, what to do. if it's not implemented... maybe it should be. 'cause many people let others use the computer but don't want any complications...
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Sep 20, 2015
I want to back up an entire Linux system on a 3Tb external Western DIgital USB3 drive.
I do not want to reformat it from what it is, apparemtly NTFS.
Is there a utility that can act like a file manager like mc, that will permit me to create an ever expanding (to 320Gb) TAR file that will retain all the original file permissions. I have had nothing but disappointment with Linux backup utils with a FAT32 external drive, and I am concerned if I just try an tar the entire drive at once, with around 3 million files, I might run out of memory.
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Apr 6, 2010
I have an ntfs partition that I wish to access as a normal user(non-root). For this I did the following. As root I created a folder /windows and did a chmod 777 -R on /windows. Then I added the following line to /etc/fstab
Code:
/dev/sda3 /windows ntfs-3g defaults,nosuid,nodev,umask=000 1 0
Now, the partition is mounted alright but the problem is that when any other user (non-root) creates a files in /windows (say by executing touch newfile) the newly created file has the owner and group set as root. The non-root user can create the file and he can also delete the file, however, he cannot change the permissions of the file and also the owner:group is always set as root:root. How do I get across this problem, i.e. how do I mount a partition, so that a non-root user can also change the permissions and ownerships of the files he creates.
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Aug 23, 2011
How do I show a list column in file roller that shows permissions and ownership of files?
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