Sponsored Content
Full Discussion: Help on Ssh using sudo
Special Forums Cybersecurity Help on Ssh using sudo Post 302913539 by anandk on Monday 18th of August 2014 10:18:51 AM
Old 08-18-2014
Help on Ssh using sudo

I'm confused in the configuration of sudoers for one group of users.
The users need to execute a app from a remote machine, in this local machine they want me to allow ssh for them using sudo
for eg. sudo -u admin ssh -X euadmin@<IP address of remote> <remote script which opens a gui>

It should work, so in the sudoers file I added this
Code:
Cmnd_Alias    MGW_SSH = /usr/bin/ssh *-X euadmin@<IP address of remote> <remote script which opens a gui>*

The problem with this is that even though this group of users were able to execute the application to open the GUI, but this opens up a security hole where the users are able to ssh to any server using the admin role like sudo -u admin master would work perfectly and the user is able to log into other servers without password I don't want this to happen.

Is there a way I can restrict these users only to run ssh for a specific server? I did search a bit but couldn't find a proper solution, so thought of contacting the expert.

regards,
Anand.K

Last edited by rbatte1; 08-19-2014 at 12:59 PM.. Reason: Spelling and grammar, adding ICODE tags for in-line code.
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

xwindows over ssh after sudo?

ok...I'm stumped on this one. I cannot figure out how to carry over my environment variables with a sudo command. I need to install an application under root and only have sudo access to get there. I can use ssh -Y <host> and launch an xwindows session successfully as myself but as soon as I sudo... (3 Replies)
Discussion started by: scottsl
3 Replies

2. UNIX for Advanced & Expert Users

sudo and ssh

Hello, Can you config sudo to use the passphrase in the user ssh-key instead of the one in the passwd? Some users do not have local passwords on the system and instead of adding the NOPASSWD in sudoers I would like the solution I asked about above. Thx Jocke (3 Replies)
Discussion started by: jOOc
3 Replies

3. UNIX for Advanced & Expert Users

sudo and ssh

Hi, I would like to know how i can perform a task, while performing ssh, sudo and command at the same time. What I generally do is I ssh to the server, where i created private and public, so it does not prompt me for password all the time. Then i need to run "sudo su - ldaprole" to get into... (9 Replies)
Discussion started by: john_prince
9 Replies

4. UNIX for Advanced & Expert Users

ssh and sudo login

Hi, I am trying to execute some command, via ssh and sudo. Here is what i want to do. ssh localhost | sudo su - ldaprole | ls -ltrh However, this command gives me listing of my home directory, and not of ldaprole. If I logic directly, when i perform sudo su - ldaprole, it... (5 Replies)
Discussion started by: john_prince
5 Replies

5. Shell Programming and Scripting

ssh foo.com sudo command - Prompts for sudo password as visible text. Help?

I am writing a BASH script to update a webserver and then restart Apache. It looks basically like this: #!/bin/bash rsync /path/on/local/machine/ foo.com:path/on/remote/machine/ ssh foo.com sudo /etc/init.d/apache2 reloadrsync and ssh don't prompt for a password, because I have DSA encryption... (9 Replies)
Discussion started by: fluoborate
9 Replies

6. Programming

Using Commands over SSH using Sudo

Is there a way to transfer my sudo password via ssh so that I can copy files remotely and pass them locally, so: cat sudo-passwd-file|ssh -t user@10.7.0.180 'sudo find / -depth|cpio -oacv|gzip' > /path/to/dir/file.cpio.gz I am in the process of a creating a script. Everytime I try and just... (16 Replies)
Discussion started by: metallica1973
16 Replies

7. Red Hat

Sudo Password Prompt over SSH

I am not sure what I am missing here. I have the following identical entry in /etc/sudoers on multiple Red Hat 6.4 servers. icinga ALL=NOPASSWD:/usr/bin/yum --security --exclude\="kernel*" check-update On one server when I enter the command over SSH as follows it works fine. ssh -t -q... (1 Reply)
Discussion started by: scotbuff
1 Replies

8. Shell Programming and Scripting

Ssh & sudo

when the following command is issued the command prompt is received, how do I get past this? ssh -t usera@hosta sudo su - userb -c id (4 Replies)
Discussion started by: squrcles
4 Replies

9. Shell Programming and Scripting

Help in creating Sudo ssh script

Hi Experts, I am new to Shell scripting. I want to login to a server using a script. The normal command I use is --> sudo ssh <Servername> . when i tried putting this into a txt format file and tried running, it throw an error "can't execute". I am an Admin and i have root access. Any help would... (6 Replies)
Discussion started by: Tom1989
6 Replies

10. Shell Programming and Scripting

Ssh does not support sqlplus and sudo -i?

Hey everybody, currently I am having an issue that I need to open an ssh session to a remote host, once on the remote host I need to use sudo and then execute sqlplus. Once the sqlplus call is open I need to execute one command while the sqlplus is active. For example show sga. I already got so... (3 Replies)
Discussion started by: h1kelds
3 Replies
SSSD-SUDO(5)						   File Formats and Conventions 					      SSSD-SUDO(5)

NAME
sssd-sudo - Configuring sudo with the SSSD back end DESCRIPTION
This manual page describes how to configure sudo(8) to work with sssd(8) and how SSSD caches sudo rules. CONFIGURING SUDO TO COOPERATE WITH SSSD
To enable SSSD as a source for sudo rules, add sss to the sudoers entry in nsswitch.conf(5). For example, to configure sudo to first lookup rules in the standard sudoers(5) file (which should contain rules that apply to local users) and then in SSSD, the nsswitch.conf file should contain the following line: sudoers: files sss More information about configuring the sudoers search order from the nsswitch.conf file as well as information about the LDAP schema that is used to store sudo rules in the directory can be found in sudoers.ldap(5). Note: in order to use netgroups or IPA hostgroups in sudo rules, you also need to correctly set nisdomainname(1) to your NIS domain name (which equals to IPA domain name when using hostgroups). CONFIGURING SSSD TO FETCH SUDO RULES
All configuration that is needed on SSSD side is to extend the list of services with "sudo" in [sssd] section of sssd.conf(5). To speed up the LDAP lookups, you can also set search base for sudo rules using ldap_sudo_search_base option. The following example shows how to configure SSSD to download sudo rules from an LDAP server. [sssd] config_file_version = 2 services = nss, pam, sudo domains = EXAMPLE [domain/EXAMPLE] id_provider = ldap sudo_provider = ldap ldap_uri = ldap://example.com ldap_sudo_search_base = ou=sudoers,dc=example,dc=com When the SSSD is configured to use IPA as the ID provider, the sudo provider is automatically enabled. The sudo search base is configured to use the compat tree (ou=sudoers,$DC). THE SUDO RULE CACHING MECHANISM
The biggest challenge, when developing sudo support in SSSD, was to ensure that running sudo with SSSD as the data source provides the same user experience and is as fast as sudo but keeps providing the most current set of rules as possible. To satisfy these requirements, SSSD uses three kinds of updates. They are referred to as full refresh, smart refresh and rules refresh. The smart refresh periodically downloads rules that are new or were modified after the last update. Its primary goal is to keep the database growing by fetching only small increments that do not generate large amounts of network traffic. The full refresh simply deletes all sudo rules stored in the cache and replaces them with all rules that are stored on the server. This is used to keep the cache consistent by removing every rule which was deleted from the server. However, full refresh may produce a lot of traffic and thus it should be run only occasionally depending on the size and stability of the sudo rules. The rules refresh ensures that we do not grant the user more permission than defined. It is triggered each time the user runs sudo. Rules refresh will find all rules that apply to this user, check their expiration time and redownload them if expired. In the case that any of these rules are missing on the server, the SSSD will do an out of band full refresh because more rules (that apply to other users) may have been deleted. If enabled, SSSD will store only rules that can be applied to this machine. This means rules that contain one of the following values in sudoHost attribute: o keyword ALL o wildcard o netgroup (in the form "+netgroup") o hostname or fully qualified domain name of this machine o one of the IP addresses of this machine o one of the IP addresses of the network (in the form "address/mask") There are many configuration options that can be used to adjust the behavior. Please refer to "ldap_sudo_*" in sssd-ldap(5) and "sudo_*" in sssd.conf(5). SEE ALSO
sssd(8), sssd.conf(5), sssd-ldap(5), sssd-krb5(5), sssd-simple(5), sssd-ipa(5), sssd-ad(5), sssd-sudo(5),sss_cache(8), sss_debuglevel(8), sss_groupadd(8), sss_groupdel(8), sss_groupshow(8), sss_groupmod(8), sss_useradd(8), sss_userdel(8), sss_usermod(8), sss_obfuscate(8), sss_seed(8), sssd_krb5_locator_plugin(8), sss_ssh_authorizedkeys(8), sss_ssh_knownhostsproxy(8),pam_sss(8). AUTHORS
The SSSD upstream - http://fedorahosted.org/sssd SSSD
06/17/2014 SSSD-SUDO(5)
All times are GMT -4. The time now is 09:04 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy