Permissions are the unix way of controlling access to resources such as files, directories and devices and may be specified for an owner, group, or all users.

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2
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1answer
128 views

Permission Advice for Webserver

The Linux box I'm managing is used mainly as a web server. The owner of a site wants to give a new user access to the site so that they can do some work on it. I've created the user account (vinod) ...
2
votes
2answers
839 views

Mount permissions always blocked

How do I authorise my non-root user to manually mount/unmount ALL media on my desktop. I always get denied permission. Media refers to all mountable USB devices and other partitions on my HDD as ...
0
votes
4answers
14k views

permission error with php/nginx and not using www-data

-edit- whats even more curious is if i chmod 777 /var/run/php-fastcgi/php-fastcgi.socket this works... if its not www-data, php-www (nor root) then what user is trying to access the socket :| -edit2- ...
1
vote
1answer
466 views

Sharing files with NFS and Unix Permissions

I'm kind of new to using NFS in the context of Linux permissions, so I'm a little lost on how I can make this work. Here's my setup: alpha writes files as root to the mounted NFS share. beta ...
2
votes
2answers
1k views

A command to check file access permission for another user

I need to know how to check the effective file access permissions for a given user, but it takes long to do this manually starting from / up to the target file or directory, checking group, ...etc.
2
votes
1answer
519 views

Problem when installing “ia32-libs”

I'm using x64 Ubuntu. A few months ago I accidentally messed up the groups/owners of all files on /, but managed to fix it using a VirtualBox install of Ubuntu. Now I'm running into a problem that I ...
0
votes
2answers
187 views

+x permission for files in directory

I'm an Ubuntu user and I'd like to change default permissions for downloaded files. Currentely all downloaded files are automatically saved with "-rw-r--r--" permissions (umask 0022). I'd like to add ...
3
votes
2answers
3k views

Terminate Root Processes

Is there a way to terminate a root process without entering an administrator's password? You might be wondering why I'd want to do this 'cause it sounds fishy. Well I just need to end a process ...
202
votes
3answers
107k views

How do directory permissions in Linux work?

In my CMS, I noticed that directories need the executable bit (+x) set for the user to open them. Why is the execute permission required to read a directory, and how do directory permissions in Linux ...
5
votes
1answer
4k views

How to give permission of a folder to a specific user in LINUX/UNIX?

How can I give permission to a specific user for a particular folder? I don't want to give permission to the entire group but only to a particular user in the group. I don't have root permissions. ...
2
votes
1answer
279 views

Grant permissions using rysnc

I want to use rsync (as a user) from "me" on a local computer to "another" user on a distant computer. However, I also want "another" user (on the distant computer) to own the files and to be able to ...
1
vote
1answer
1k views

Allow www-data to execute a a script

I am trying to execute a script that will read a file written by PHP. The problem is that the script opens and some other files (C-ISAM file based database) and i have no clue what permisions to give ...
18
votes
7answers
56k views

“Symbolic link not allowed or link target not accessible” / Apache on CentOS 6

I've got a brand new CentOS 6 installation, which has a symlink in the document root to my development files: [root@localhost html]# ls -l total 4 -rwxrwxrwx. 1 root root 0 Sep 18 20:16 index.html ...
2
votes
4answers
2k views

SAMBA Share - Keep user from deleting a file

I'm creating a hidden "Access Log" .txt file of employees accessing a program I've created and need to know how to make it so this file cannot be deleted. Reason being, this program helps to automate ...
45
votes
4answers
29k views

Clone ownership and permissions from another file?

Is there a command or flag to clone the user/group ownership and permissions on a file from another file? To make the perms and ownership exactly "like" that of another file?
0
votes
2answers
784 views

Files uploaded as root to the web server can't be overwritten by web application

Here is my problem. I am developing a web application in PHP/MySQL and I am having some problems setting up the accounts I need to use. Development workstation: WinXP SP3, Eclipse PDT Development ...
3
votes
1answer
1k views

Prevent a subdirectory from getting deleted / enforce a directory structure

imagine the following folder structure ../documents ../documents/templates I have two user groups: editors managers Users of both groups should be able to create new files modify any ...
25
votes
3answers
19k views

Is there any way to prevent deletion of certain files from user owned directory?

Let's say user has Directory1 and it contains File1 File2 CantBeDeletedFile How to make so the user would never be allowed to delete the CantBeDeletedFile? If I change the ownership of Directory1 and ...
2
votes
1answer
89 views

Get rights for specific user on file/dir

I'm searching for a command that essentially would do the following: check which rights a user has on a file/dir (including ACL) and return it. E.g. say you have the following directory: -rw-r--r-- ...
8
votes
2answers
1k views

How can I change the permissions in /sys to alter the state of a LED/light using `udev`?

I've got a Thinkpad and would like to use the ThinkLight (the white flash light above the screen designed to light up the keyboard) for notifications on incoming Jabber messages. It is easy to ...
9
votes
2answers
4k views

recursively change file permission but not directories?

I was doing a mass recursive change of permissions of some files that I had migrated to a unix system. I changed them to ug+rw, but then I found that I could not traverse subdirectories. I looked at ...
5
votes
2answers
4k views

Permission denied (even as root) on a mounted ISO image with Furius ISO Mount

I mounted a ISO image with Furius ISO Mount. I cd to the mounted directory and tried to copy a file with sudo cp file /dir but cp writes error message cp: cannot stat `file': Permission denied ...
9
votes
1answer
5k views

Why can't sudo redirect stdout to /etc/file, but sudo 'nano' or 'cp' can? [duplicate]

Why does redirection, using sudo give me an error for the following commands? $ sudo printf "foo" >/etc/file bash: /etc/file: Permission denied $ sudo printf "foo" ~/file; cat ~file ...
2
votes
1answer
136 views

Suddenly changing users [closed]

Has anyone ever encountered a scenario where you are logged into a system going about your standard business, cat, ls, tail, grep, vim, find etc. and suddenly permissions to regular things stop ...
2
votes
1answer
5k views

How can I create a unionfs-fuse mount that is readable by all?

I'd previously used aufs2 in aufs-tools with some luck, but apparently this package has been "superseded" (this is strange term to use for a package which seems to have been removed only because it no ...
4
votes
1answer
3k views

Determine if the current user has write permission in a directory

I know you can determine the owner of directory by doing: ls -ld ~/foo | awk '{ print $3 }' You could then compare it to the current user by doing this: if [[ $(ls -ld ~/foo | awk '{ print $3 }') ...
23
votes
3answers
17k views

How to apply changes of newly added user groups without needing to reboot?

Assume I'm logged in with user takpar: takpar@skyspace:/$ As root, I've added takpar as a member of group webdev using: # usermod -a -G webdev takpar But it seems it has not been applied. because ...
3
votes
2answers
435 views

Permissions of webserver's root directory

I've had this issue on several setups, and I'm unsure of how to handle it. At first, all of /var is owned by root:root. Clearly I don't want the web directory to be owned by root, so I do chown ...
6
votes
4answers
4k views

Allow users to run only specific binaries with root permissions/privileges

I would like to allow a specific user to be able to sudo /sbin/iptables only. I have a bash script which configures iptables. The problem is that configuring /sbin/iptables as sudoable is not enough ...
2
votes
1answer
69 views

Creating Directories: with Permissions

I need to create a directory that is RW to all users using chown. what arguments should I pass chown to get a file with those permissions? Or maybe there is an even better way to do it......
9
votes
3answers
15k views

Correct permissions for /var/www/html?

I'm able to write changes in the home directory, but when it comes to the /var/www/html folder, it's not allowing me to make any changes or create new files or folders. I'm able to view the files in ...
4
votes
2answers
2k views

Which user group can use the 'tap' net device?

I use the 'tap' net device with KVM to get my vm connect to the Internet. But I have to be root, or use 'sudo', which is inconvenient. I think I can put my user account into some group so I can access ...
2
votes
0answers
1k views

Permissions for Apache and FTPd users

I'd like advice about permissions on directories and files on a web/ftp server. Here is my situation: Debian Server with those user:group userme:userme for SSH www-data:www-data for apache/php ...
6
votes
1answer
11k views

In Linux, “Write” Permission Is Equivalent To “Execute” For Directories?

The Execute permission makes sense for files (which include scripts etc), but when it comes to directories, write (w) permission works the same way as execute (x), right? Which means, if we are giving ...
6
votes
6answers
22k views

How can I create and grant a normal user with root privileges?

I'm wondering how to create and grant a normal user (for example, named 'sybase') with root privileges? I found useradd, adduser, and passwd to be useful, but are there any other files to modify to ...
3
votes
1answer
170 views

mounting volume protected against user access

I need to mount a directory in a way that prevents user accessing it. However I need to have access to all attributes (including permission) from root. Is following method safe or is there a way ...
12
votes
1answer
8k views

Why does root get Permission denied when accessing FUSE directory?

I use a FUSE filesystem with no problems as my own user, but root can't access my FUSE mounts. Instead, any command gives Permission denied. How can I give root the permission to read these mounts? ...
5
votes
4answers
2k views

Selinux is denying access to mysqld

I have a script that dumps a mysql database. It then compresses the file and this gets stored in my home folder by using cron. The problem is I seem to be getting an error message. mysqldump: ...
2
votes
1answer
5k views

Permissions issue with git

I have a development machine that use runs on CentOs. Whenever i pull from git using git pull i get "permission denied" issue/error. Git apparently doesn't have the permission to overwrite the ...
4
votes
3answers
1k views

Is it Safe to chown on /usr/lib?

Can I do this? sudo chown -R myUsernName /usr/lib I mean can I do this without worrying that my OS will be broken? Or permissions will be screwed up? Here is the reason why I would like to do it ...
9
votes
5answers
19k views

How to get back sudo on Ubuntu?

I have done this: sudo chown -R myname /usr/ and now I can't use the sudo command because of this error: sudo: must be setuid root And as I read this means that the owner of this file ...
3
votes
2answers
14k views

Permissions “problem” using SCP to copy to root owned folder from local

I'm taking some early forays into setting up a basic LAMP box. It's my first time setting up the software I'll use as opposed to just being handed a working environment, so go easy on me :) I have ...
10
votes
3answers
4k views

What roles do DAC (file permissions), ACL and MAC (SELinux) play in Linux file security?

I need some clarification/confirmation/elaboration on the different roles DAC, ACL and MAC play in Linux file security. After some research from the documentation, this is my understanding of the ...
15
votes
8answers
45k views

Problem to launch java at Debian: “error while loading shared libraries: libjli.so”

I'm trying to launch java: $ java -version java: error while loading shared libraries: libjli.so: cannot open shared object file: No such file or directory $ ldd ...
2
votes
2answers
1k views

How do I reset ownership on /usr/bin/sudo on centOS? [closed]

I accidentlly changed ownership of /usr/bin/sudo to my current user (i also did this for some other stuff in my /usr directory). I can't change any of them back because I need ownership of ...
5
votes
4answers
10k views

File permission execute only

How can I set file to be executable only to other users but not readable/writable, the reason for this I'm executing something with my username but I don't want to give out the password. I tried : ...
3
votes
2answers
120 views

Can I run a command with specific privileges on certain directories?

I would like to be able to run a command, passing in parameters to bash or similar, such that this command is not allowed to write to a particular path, overriding the user's other privs. Eg: ...
5
votes
1answer
536 views

ACL mask does not work as expected

If I copy a file with a base ACL of: u::rw-,g::r--,o::r-- into a directory with a default ACL of: u::rwx,g::r-x,g:users:rwx,m::rwx,o::r-x I obtain a file with mask of m::r--. I would have ...
1
vote
2answers
2k views

permission denied when executing a binary

I used these instructions to install mongodb on my OS X machine. I did not make the files owned by root though, I used my local user (markdsievers), and installed to /usr/local/mongodb and ...
1
vote
2answers
278 views

Weird executabe behaviour

I have a server machine with ubuntu 9.10. I am trying to put in place an executable, which turns out to be the latest flashplayer (debugger version). Somehow the file appears as present and ...