Sponsored Content
Top Forums UNIX for Advanced & Expert Users Setup SUDO For a User on Linux Server Post 302440005 by STOIE on Sunday 25th of July 2010 08:14:16 PM
Old 07-25-2010
Ikon, use a group my boy. hehehe

Standardization is king!

Only reason why I actually think I should mention this is, because at work doing this nearly every day, if you continue to add users into the sudoers file then you may just mistype something and kill sudo sys-wide. Better to have groups you can simply add users to, again, you will still need to initially config sudoers, but, adding more people down the track is easier.

And again, you are supposed to use visudo to get around /etc/sudoers corruption, but, as Jokob mentioned the file itself, manual editing should be as limited as possible.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

setup of user a/c in mysql in linux

Hi Friends, I am new user of linux operating system. I wanted to install a software but facing a difficulty. I am not able to proceed to the next statement without resolving this. WFT is the software i need for my purpose. Setup a MySQL user account for WTF that will have access to ... (1 Reply)
Discussion started by: alma
1 Replies

2. Linux

how to setup a virtual IP to control 2 server load for linux

Hi anyone know how to setup a setup a virtual IP to control 2 server load for linux? i only have 2 server, i don want to buy another just for the load balance... is there a way to do it? Sumemr (0 Replies)
Discussion started by: summerpeh
0 Replies

3. AIX

NIM server setup on etherchannel setup environment

I know that IBM's official stance is that NIM does not work on etherchannel environment, but has anyone able to get around it? I'm working on a p5-590 LPAR system, and the NIM master and clients are all on the same frame. Any help is appreciated. (1 Reply)
Discussion started by: pdtak
1 Replies

4. UNIX for Advanced & Expert Users

Remove and block a user from Linux server

Hi, Can anyone please guide me how can I remove/block a user from a server access. /usr/sbin/adduser -d /home/john john echo ****** | passwd --stdin john I used the above command to add a user "john". How do I delete and block john. Appreciate your responses. (1 Reply)
Discussion started by: sureshcisco
1 Replies

5. Linux

problems in linux mail server setup

hi i want to set up LInux mail server for intranet purpose. i used following document as reference Linux Mail Server softwares used are : Postfix # pre installed Procmail # pre installed Fetchmail # pre installed SpamBayes Mutt #... (1 Reply)
Discussion started by: zedex
1 Replies

6. AIX

sudo setup

I am working on setting sudo on a few AIX servers and wanted to know how to give users root access without allowing them access to the sudo logs, sudoers files and the /etc/security directory. (3 Replies)
Discussion started by: daveisme
3 Replies

7. Red Hat

setup sudo for cmd exec w/o password

i need to set up a user to execute a restricted command as another user and to be able to do so without entering a password. I understand the security concerns but let's not go there, unless you are really compelled to do so... The directive to permit is that I believe should work and did add to... (2 Replies)
Discussion started by: twk
2 Replies

8. Linux

Linux- Useradd / sudo user

Hi, I am new in linux. Please help for create new user and also need to give sudo access in linux box. Please help me Now i am having new access Thanks, Mani (2 Replies)
Discussion started by: Mani_apr08
2 Replies

9. UNIX for Dummies Questions & Answers

Samba setup in virtual server environment Windows/ Linux

I have a home network set up that consists of a few windows clients and 3 centos, and 1 suse client. These are all virtual machines, VMware Workstation. One centos vm is set to be the Samba server. Do I need Samba set up on the other Linux clients?I have no problem seeing the windows clients... (0 Replies)
Discussion started by: ktb231
0 Replies

10. UNIX for Advanced & Expert Users

Setup Samba Server to always ask user and password

How do I setup a Samba server to always ask to user and password, when a windows user, prints your files using a shared printer through a Samba Linux Server (CUPS)? (0 Replies)
Discussion started by: viga
0 Replies
VISUDO(8)						    BSD System Manager's Manual 						 VISUDO(8)

NAME
visudo -- edit the sudoers file SYNOPSIS
visudo [-chqsV] [-f sudoers] [-x output_file] DESCRIPTION
visudo edits the sudoers file in a safe fashion, analogous to vipw(8). visudo locks the sudoers file against multiple simultaneous edits, provides basic sanity checks, and checks for parse errors. If the sudoers file is currently being edited you will receive a message to try again later. There is a hard-coded list of one or more editors that visudo will use set at compile-time that may be overridden via the editor sudoers Default variable. This list defaults to /usr/bin/editor. Normally, visudo does not honor the VISUAL or EDITOR environment variables unless they contain an editor in the aforementioned editors list. However, if visudo is configured with the --with-env-editor option or the env_editor Default variable is set in sudoers, visudo will use any the editor defines by VISUAL or EDITOR. Note that this can be a security hole since it allows the user to execute any program they wish simply by setting VISUAL or EDITOR. visudo parses the sudoers file after the edit and will not save the changes if there is a syntax error. Upon finding an error, visudo will print a message stating the line number(s) where the error occurred and the user will receive the ``What now?'' prompt. At this point the user may enter 'e' to re-edit the sudoers file, 'x' to exit without saving the changes, or 'Q' to quit and save changes. The 'Q' option should be used with extreme care because if visudo believes there to be a parse error, so will sudo and no one will be able to run sudo again until the error is fixed. If 'e' is typed to edit the sudoers file after a parse error has been detected, the cursor will be placed on the line where the error occurred (if the editor supports this feature). The options are as follows: -c, --check Enable check-only mode. The existing sudoers file will be checked for syntax errors, owner and mode. A message will be printed to the standard output describing the status of sudoers unless the -q option was specified. If the check completes successfully, visudo will exit with a value of 0. If an error is encountered, visudo will exit with a value of 1. -f sudoers, --file=sudoers Specify an alternate sudoers file location. With this option, visudo will edit (or check) the sudoers file of your choice, instead of the default, /etc/sudoers. The lock file used is the specified sudoers file with ``.tmp'' appended to it. In check-only mode only, the argument to -f may be '-', indicating that sudoers will be read from the standard input. -h, --help Display a short help message to the standard output and exit. -q, --quiet Enable quiet mode. In this mode details about syntax errors are not printed. This option is only useful when combined with the -c option. -s, --strict Enable strict checking of the sudoers file. If an alias is referenced but not actually defined or if there is a cycle in an alias, visudo will consider this a parse error. Note that it is not possible to differentiate between an alias and a host name or user name that consists solely of uppercase letters, digits, and the underscore ('_') character. -V, --version Print the visudo and sudoers grammar versions and exit. -x output_file, --export=output_file Export a sudoers in JSON format and write it to output_file. If output_file is '-', the exported sudoers policy will be written to the standard output. By default, /etc/sudoers (and any files it includes) will be exported. The -f option can be used to specify a different sudoers file to export. The exported format is intended to be easier for third-party applications to parse than the traditional sudoers format. The various values have explicit types which removes much of the ambiguity of the sudoers format. Debugging and sudoers plugin arguments visudo versions 1.8.4 and higher support a flexible debugging framework that is configured via Debug lines in the sudo.conf(5) file. Starting with sudo 1.8.12, visudo will also parse the arguments to the sudoers plugin to override the default sudoers path name, UID, GID and file mode. These arguments, if present, should be listed after the path to the plugin (i.e. after sudoers.so). Multiple arguments may be specified, separated by white space. For example: Plugin sudoers_policy sudoers.so sudoers_mode=0400 The following arguments are supported: sudoers_file=pathname The sudoers_file argument can be used to override the default path to the sudoers file. sudoers_uid=uid The sudoers_uid argument can be used to override the default owner of the sudoers file. It should be specified as a numeric user ID. sudoers_gid=gid The sudoers_gid argument can be used to override the default group of the sudoers file. It must be specified as a numeric group ID (not a group name). sudoers_mode=mode The sudoers_mode argument can be used to override the default file mode for the sudoers file. It should be specified as an octal value. For more information on configuring sudo.conf(5), please refer to its manual. ENVIRONMENT
The following environment variables may be consulted depending on the value of the editor and env_editor sudoers settings: VISUAL Invoked by visudo as the editor to use EDITOR Used by visudo if VISUAL is not set FILES
/etc/sudo.conf Sudo front end configuration /etc/sudoers List of who can run what /etc/sudoers.tmp Lock file for visudo DIAGNOSTICS
In addition to reporting sudoers parse errors, visudo may produce the following messages: sudoers file busy, try again later. Someone else is currently editing the sudoers file. /etc/sudoers.tmp: Permission denied You didn't run visudo as root. you do not exist in the passwd database Your user ID does not appear in the system passwd database. Warning: {User,Runas,Host,Cmnd}_Alias referenced but not defined Either you are trying to use an undeclared {User,Runas,Host,Cmnd}_Alias or you have a user or host name listed that consists solely of uppercase letters, digits, and the underscore ('_') character. In the latter case, you can ignore the warnings (sudo will not complain). The message is prefixed with the path name of the sudoers file and the line number where the undefined alias was used. In -s (strict) mode these are errors, not warnings. Warning: unused {User,Runas,Host,Cmnd}_Alias The specified {User,Runas,Host,Cmnd}_Alias was defined but never used. The message is prefixed with the path name of the sudoers file and the line number where the unused alias was defined. You may wish to comment out or remove the unused alias. Warning: cycle in {User,Runas,Host,Cmnd}_Alias The specified {User,Runas,Host,Cmnd}_Alias includes a reference to itself, either directly or through an alias it includes. The mes- sage is prefixed with the path name of the sudoers file and the line number where the cycle was detected. This is only a warning unless visudo is run in -s (strict) mode as sudo will ignore cycles when parsing the sudoers file. unknown defaults entry "name" The sudoers file contains a Defaults setting not recognized by visudo. /etc/sudoers: input and output files must be different The -x flag was used and the specified output_file has the same path name as the sudoers file to export. SEE ALSO
vi(1), sudo.conf(5), sudoers(5), sudo(8), vipw(8) AUTHORS
Many people have worked on sudo over the years; this version consists of code written primarily by: Todd C. Miller See the CONTRIBUTORS file in the sudo distribution (https://www.sudo.ws/contributors.html) for an exhaustive list of people who have contrib- uted to sudo. CAVEATS
There is no easy way to prevent a user from gaining a root shell if the editor used by visudo allows shell escapes. BUGS
If you feel you have found a bug in visudo, please submit a bug report at https://bugzilla.sudo.ws/ SUPPORT
Limited free support is available via the sudo-users mailing list, see https://www.sudo.ws/mailman/listinfo/sudo-users to subscribe or search the archives. DISCLAIMER
visudo is provided ``AS IS'' and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. See the LICENSE file distributed with sudo or https://www.sudo.ws/license.html for com- plete details. Sudo 1.8.21p2 February 22, 2017 Sudo 1.8.21p2
All times are GMT -4. The time now is 09:09 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy