Where sudo requests the user to enter a password this is normally their own password rather than the root password Ubuntu and some other distributions take this further by not having a root password meaning that root access can only be obtained through sudo.
Linux file access permissions reference Introduction Linux file access permissions are used to control who is able to read, write and execute a certain file. Jun 27 dirlist. This means that the owner, group and everyone else has read and write permissions.
These can actually be used to switch to any user, but it is most commonly used when root privileges are required. Next column orange shows the permissions. They also cannot delete any files or make changes to the directory content in any way. This is an important consideration due to the multi-user nature of Linux systems and as a security mechanism to protect the critical system files both from the individual user and from any malicious software or viruses.
There also also features that can also be used to give permissions as though another user suid. For example the following example is often used on Ubuntu to install a new application: In the case of a directory, nothing much changes as the same command is used.
If write permission is not set then you will not be able to delete, rename or create a file. The sudo command can be much more flexible than su, depending upon how it is configured.
Each of these permissions is assigned a number as follows: A further advantage of sudo is that user access is logged which may be required as a security feature on a server with multiple adminstrators. The system identifies files by their inode number, which is the unique file system identifier for the file.
The commands su and sudo are run on the command line, but there is a graphical version called gksudo. So we conclude that david has full access here.
Depending upon the setup and whether physically on the computer or access it remotely it may or may not be possible to login directly as root.
Starting from the left, the first digit 7 presents the permissions for the owner of the file, the second digit 0 is the permissions for the group, and the last 0 is the permissions for everyone else. To elevate to root user access the commands su or sudo are used.
In the case of a directory, this would mean the ability to list the contents of the directory. File Structure Inodes To understand the way that permissions work it is often useful to understand how the file permissions are stored on the disk. A directory is actually a listing of inode numbers with their corresponding filenames.
Once the user has authenticated themselves using sudo it will normally have a period of time where sudo can be run without having to re-enter the password.
Note that the admin or wheel groups are commonly used to restrict who can run sudo but this is a popular convention rather than a rule. You must have read and execute r-x in order to enter a directory and list its contents. Whether the file may be executed.
Following the permissions is the column with the cyan border in the listing. This user has username and groupname of root and the numerical uid and gid of 0. These are the actual permissions set for the particular file or directory we are examining.Understanding Linux File Permissions Although there are already a lot of good security features built into Linux-based systems, one very important potential vulnerability can exist when local access is granted - - that is file permission based issues resulting from a user not assigning the correct permissions to files and directories.
How to Manage File and Folder Permissions in Linux.
For many users of Linux, getting used to file permissions and ownership can be a bit of a challenge. It is commonly assumed, to get into this level of usage, the command line is a must.
Group, and Other read and write access. As you can probably surmise, this command opens wide the. Is it possible in linux to give a user read/write access to all files and directories like root?
EDIT I have a special case. I need to create a folder. A word of warning: if you let everybody access this folder, that means the hackers can access this folder if they gain access to your system.
That's why it's better to create a group of permissible users, and give that group write access. In linux, how can I give access permissions to a file/folder to a specific person. In other words suppose I want to allow only and only user fred to be able to read a file.
Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Give read-only access to specific folders? Ask Question. up vote 8 down vote favorite. 4. jack and jack's group will have read+write access to /home/jack and all it's sub-directories.
The rest will have only read.Download