Guide to the Secure Configuration of openSUSE
Rules, Groups, and Values defined within the XCCDF Benchmark
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SSH Server
The SSH protocol is recommended for remote login and remote file transfer. SSH provides confidentiality and integrity for data exchanged between two systems, as well as server authentication, throu...Group -
SSH Max Sessions Count
Specify the maximum number of open sessions permitted.Value -
SSH Max Keep Alive Count
Specify the maximum number of idle message counts before session is terminated.Value -
Install the OpenSSH Server Package
The <code>openssh-server</code> package should be installed. The <code>openssh-server</code> package can be installed with the following command: <pre> $ sudo zypper install openssh-server</pre> ...Rule Medium Severity -
Install the OpenSSH Client and Server Package
Theopenssh
package should be installed. Theopenssh
package can be installed with the following command:$ sudo zypper install openssh
Rule Medium Severity -
Remove the OpenSSH Server Package
Theopenssh-server
package should be removed. Theopenssh-server
package can be removed with the following command:$ sudo zypper remove openssh-server
Rule Medium Severity -
Remove the OpenSSH Client and Server Package
Theopenssh
package should be removed. Theopenssh
package can be removed with the following command:$ sudo zypper remove openssh
Rule Medium Severity -
Disable SSH Server If Possible
The SSH server service, sshd, is commonly needed. However, if it can be disabled, do so. This is unusual, as SSH is a common method for encrypted and authenticated remote access.Rule High Severity -
Verify Group Ownership on SSH Server Private *_key Key Files
SSH server private keys, files that match the/etc/ssh/*_key
glob, must be group-owned byroot
group.Rule Medium Severity -
Verify Group Ownership on SSH Server Public *.pub Key Files
SSH server public keys, files that match the/etc/ssh/*.pub
glob, must be group-owned byroot
group.Rule Medium Severity -
Verify Ownership on SSH Server Private *_key Key Files
SSH server private keys, files that match the/etc/ssh/*_key
glob, must be owned byroot
user.Rule Medium Severity -
Verify Ownership on SSH Server Public *.pub Key Files
SSH server public keys, files that match the/etc/ssh/*.pub
glob, must be owned byroot
user.Rule Medium Severity -
Verify Permissions on SSH Server Private *_key Key Files
SSH server private keys - files that match the <code>/etc/ssh/*_key</code> glob, have to have restricted permissions. If those files are owned by the <code>root</code> user and the <code>root</code...Rule Medium Severity -
Verify Permissions on SSH Server Public *.pub Key Files
To properly set the permissions of/etc/ssh/*.pub
, run the command:$ sudo chmod 0644 /etc/ssh/*.pub
Rule Medium Severity -
SSH RekeyLimit - size
Specify the size component of the rekey limit.Value -
SSH Compression Setting
Specify the compression setting for SSH connections.Value -
SSH Privilege Separation Setting
Specify whether and how sshd separates privileges when handling incoming network connections.Value -
SSH LoginGraceTime setting
Configure parameters for how long the servers stays connected before the user has successfully logged inValue -
SSH MaxStartups setting
Configure parameters for maximum concurrent unauthenticated connections to the SSH daemon.Value -
Set SSH Client Alive Count Max to zero
The SSH server sends at most <code>ClientAliveCountMax</code> messages during a SSH session and waits for a response from the SSH client. The option <code>ClientAliveInterval</code> configures time...Rule Medium Severity
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