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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setuid (and other) permissions lost when copying / elsewhere - what to do?

I sort-of-cloned an existing Debian 7.x distro by copying the contents of the root filesystem (not the special dirs of course) to another HDD. I booted, things seem to run, but - I get some weird ...
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4answers
421 views

What are the root permissions for a file?

If I type: ls -l file.txt I see that the rights for that file are equivalent to "456": 4 = owner (r--) 5 = group (r-x) 6 = others (rw-) Which the rights for root in this case? Does it have 777? ...
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1answer
11 views

Proper create user account with permissions on CentOS/Apache

I have setup a CentOS VPS to run apache, I am having trouble with permissions when creating an account. I have setup a virtual host host to point a domain to /home/user/public_html <VirtualHost ...
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1answer
15 views

Crunchbang: Can't use simple-scan without administrator rights

I'm running the latest version of Crunchbang 64-bit on a Dell E5510 notebook. Installing my printer and scanner worked fine - I just used an existing Ubuntu tutorial. However, scanning without ...
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4answers
12k 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 ...
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0answers
42 views

Linux Executable with Unknown type asking to be executable every time I run it in Nemo

When I try to open an executable with the type Unknown I get a message saying: "The file 'file name' has no known programs associated with it. If you trust the source of this file, and have ...
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0answers
13 views

grub permission error

I had some package and a kernel update today on my Debian work computer. When running sudo apt-get install I get the following: paul@icarus:~$ sudo apt-get install Reading package lists... Done ...
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3answers
17k views

How to grant read/write to specific user in any existent or future subdirectory of a given directory?

I'm a complete newbie in system administration and I'm doing this as a hobby. I host my own git repository on a VPS. Let's say my user is john. I'm using the ssh protocol to access my git ...
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1answer
33 views

rysnc files and folders into a location without altering permissions

I'm using rsync to deploy some static HTML that is going to be served by nginx. The user that is running rysnc is "jenkins" nginx is using the www-data group to access the folder. jenkins is member ...
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1answer
9k views

Changing user and group ID system wide (including file system attributes)?

(this question possibly related to Linux: simulating/masking user ownership upon mount of 'external' partitions? - Stack Overflow) I typically use Ubuntu (currently 11.04) as my desktop OS; let's say ...
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0answers
23 views

Is it logical to give root execution to some commands executed by a normal user? [on hold]

Given a C/C++ program that uses some system calls or commands, say for example sockets. In this question the solution gives root access to a normal user to run a specific one executable, which means ...
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3answers
39 views

Ownership of a mount point

I cannot create files in my newly mounted partition . The folder to which i am mount the partition, /media/hrmount, is owned by root so even if I add a fstab line like UUID=irrelevant ...
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1answer
21 views

Permissions to see content

If the owner/group of a folder and/or is set to 0 0 (zero zero), can I see its content? I'm trying to access a directory with such permissions.
108
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8answers
9k views

How to chmod without /usr/bin/chmod?

Today I was told a tale by a Unix trainer, a tale where the root password got leaked to the students, and one of the fellas removed the execute permission from /usr/bin/chmod itself. How do you ...
3
votes
1answer
27 views

How passwd command from non-root account succeeds

I am trying to change my password as a non root user : passwd The data is updated in /etc/shadow, but checking the permission i get: ---------- 1 root root 6076 Jan 27 17:14 /etc/shadow cat ...
2
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0answers
33 views

Disable viewing/listing rights to users

I'm new to linux administration and I'm not sure how to search for this problem. When I create a new user, s/he can browse the filesystem. E.g. ll /. How can I restrict the user to a few select ...
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0answers
25 views

Having trouble grasping Synologys permission system

I've got a DS1513+ running an LDAP server and I'm trying to get my permissions working. What I am trying to do is setting up a share all for myself. I created a share(d folder), lets name it ...
81
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1answer
91k views

How to set default file permissions for all folders/files in a directory?

I want to set a folder such that anything created within it (directories, files) inherit default permissions and group. Lets call the group "media". And also, the folders/files created within the ...
0
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1answer
54 views

How to make directory writable?

I just installed apache2 and WordPress on my RPi. I followed this tutorial. After its successful installation, I moved on to customization. But when I upload any images, etc. I receive the following ...
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0answers
39 views

Linux: how to run a program with rw access to only a folder

How can I execute a program in a way that all the system is RO and only some folders are RW? Eg: steam (:P) roexec --rw ~/.steam steam Is there any tool that allows me to do this? I've tried mount ...
3
votes
1answer
596 views

How do I allow user permissions to data on a Couchpotato and Sickbeard Plugin using Freenas

Trying to setup permissions for the plugins sickbeard / couchpotato. I’ve read almost every thread google / the forums have but haven’t really found a solution yet. I’m assuming it’s the data here: ...
2
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4answers
299 views

Moving a directory from a user to another user, keeping the correct permissions

Let's suppose we have to users: alice and bob. Now Bob wants to move Alice's ~/Documents directory into his home folder. What's the best workflow to do that, updating the permissions (from Alice to ...
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3answers
28 views

What should the permissions be for website files?

I've locked down my CentOS web server so root can't SSH in. My website directories, and files are owned by root. So when I upload files, it's a two step process. I upload them with WinSCP to my /home ...
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1answer
2k views

Give read-only access to specific folders?

I would like to give read-only access to a user but I want him/her to see only the exact folders I give access. for example he/she shouldn't travel around all the server and browse to all users ...
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1answer
38 views

Permission 0000 in /var/www/html through the sFTP

I can write in /var/www/html through the terminal in ssh, but to create a file by sftp through Filezilla, the file created have permissions 000. How do I fix this? My problem is with these ...
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2answers
20 views

Common user to modify files owned by 'other' users

I would like to understand how to use the permission system in CentOS to achieve the following: The system has the following users: user1 user2 user3 And the following directory structure.. ...
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0answers
48 views

ssh not using ~/.ssh/config, even after I play around with permissions

I tried modifying my ~/.ssh/config file to allow automatic fast X forwarding as per this site http://xmodulo.com/how-to-speed-up-x11-forwarding-in-ssh.html I then tried logging into a server and ...
2
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2answers
434 views

SMB Mount To Windows Server Appears to Lock up. Any Ideas?

We are running CentOS 6.3 with all the latest updates. (Attempt to resolve this issue) The Server I am trying to connect to is a Windows Server 2008 R2 box. Though this applies to our old SBS'03 Box ...
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3answers
2k views

How to remount as read-write a specific mount of device?

How to remount as read-write a specific mount of device? (one folder) The file is "Read-only file system", rw-r-r, so it not allow to change permissions. I need to replace that file, then change ...
0
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1answer
27 views

Hide directory listing? chmod 730 /home/share? [duplicate]

So I want to hide the listing of all files to a particular group, yet I want them to be able to create/read files in that same folder. The following permissions on the folder appears to work (write ...
1
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1answer
17 views

Why can't an SGID program read a file from the same group if it's used by another user?

The "wall" command has SGID for the tty group. The proba file has the tty group. The FS that has the wall binary has no SGID mount option. I thought the wall command would just output the proba's ...
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0answers
752 views

FreeRadius/Samba/Winbind “reading winbind reply failed” error

I'm trying to set up FreeRadius (on debian 7, samba 3.6.6) to authenticate with AD, and I've successfully joined the the radius machine to the domain (server 08 r2). I can successfully run wbinfo ...
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2answers
722 views

Linux Permissions vsftpd

I have mybb installed and running in /var/www/forums. I have two users part of the www group, logan and www-data. I have the recursive permissions of forums directory set to: chmod -R 755 forums ...
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1answer
16 views

What is the difference between these two sets of command for configuring ACL permissions?

Hi I am wondering what is the difference between the two sets of commands below: 1) To allow Davis to access and modify all files and folders in the the home directory of John # setfacl -m ...
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0answers
20 views

Configure server such thata non-root user can deploy a Python web application (Django, Flask, …)

I have deployed a Django and a Flask app on my local Debian server where I have root access. A friend of mine has a server running Ubuntu server. I just have a user account there. Is there some way ...
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0answers
41 views

Sudo User: Not able to see the home directory of other users

I created sudo user hrsupport with following commands: hrsupport ALL=ALL, NOPASSWD: /bin/chown, /bin/chmod, /bin/chgrp, /scripts/pkgacct, /scripts/restorepkg How can I achieve this The hrsupport ...
2
votes
1answer
124 views

How can I set device rw permissions permanently on Raspbian?

I'm using the Raspbian (a distribution made for Raspberry Pi, which is based on Debian). I have some scripts that use i2c. Normally only root has read and write permissions for i2c. I'm using this ...
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0answers
18 views

How can I set a folder undeletable but have R/W permissions to it's content [duplicate]

I have a directory which I'd like to mark as not deleteable, but have all the usual permissions of read/write/delete on all subdirectories and files. How can I achieve this? I tried setting the ...
0
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3answers
37 views

/etc/passwd permissions and GECOS field

The default permissions on Ubuntu (or even some BSD) distributions for the /etc/passwd file are 644. It is pointed out in questions like this that /etc/passwd is a sort of user database and it is ...
2
votes
1answer
32 views

Set group ownership on FTP upload via an ACL

I am interested in setting an ACL which will chown all the files I upload through FTP to the www-data group. However, after performing chown -R user:www-data /var/www/website.com/public_html/ ...
1
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1answer
38 views

Still able to read file after changing permissions

I've made a file as root, and written a string in it. Now I've changed mode to "0" like this: root# ls -al transit/ total 4.0K ---------- 1 root root 6 Jan 5 18:15 27050 root# If I try to tail, ...
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1answer
16 views

File permissions on uploaded files

This is hopefully a simple question. I have a VPS set up running LAMP and accepting FTP connections. the only problem with my setup at the moment seems to be that apache is denied access to uploaded ...
5
votes
3answers
1k views

Maintain (or restore) file permissions when replacing file

I have a command that accepts a file as an argument, modifies the file, then writes it to the file name specified in the second argument. I'll call that program modifyfile. I wanted it to work "in ...
2
votes
1answer
2k views

How can ubuntu/truecrypt be configured so users can mount volumes if-and-only-if they have proper permissions on the mount-point?

If I add the line: ALL= /usr/bin/truecrypt to the sudoers file this lets all users mount volumes at arbitrary mount-points. The problem is a user could create a truecrypt volume and then mount it at ...
0
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1answer
19 views

Sendmail on hpux: error dsn 5.0.0

I am running sendmail as user smmsp. I have create user,group with same name. sendmail starts ok, but when I try to send email outside of localhost give me this error: Jan 3 20:46:59 hpux2 ...
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0answers
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Is file creation atomic?

I have a problem to solve: I just can make one CURL operation each second, but this operation can send up to 40 parameters. Those parameters are Id's. I have one web site that may sometimes ask for ...
3
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1answer
28 views

Protecting process's envvars from exposure

From I've read about current best practices for developing web applications (such as the Twelve Factor guide), the recommended approach for storing configuration data is within environment variables. ...
3
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3answers
5k views

Pulseaudio failed to create secure directory in nfs share

My pulseaudio cannot run, because it attempts to create ~/.config/pulse under a different user. (probably pulse?). user@localhost ~$ pulseaudio E: [pulseaudio] core-util.c: Failed to create secure ...
0
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1answer
26 views

Can't access VirtualBox share from MediaTomb

I just installed Mint 17.1 Cinnamon as a virtual machine using VirtualBox. I want the VM to act as a media server running MediaTomb, however MediaTomb can't access my VirtualBox share. I know I'm ...
3
votes
2answers
986 views

NFS partition mounted as read only

(Disclaimer: I've read "NFS sharing is read only" and I think it's not the same problem) I have just setup NFS on my raspberry (Raspbian) and I'm trying to access it from OSX. So far so good, I can ...