Linux create softlink

user01 is the user id and the softlink name under / root

ln -s /home/e-smith/files/users/user01/home user01

SME Linux SSH autoblock

The Link

 https://wiki.contribs.org/AutoBlock

Default values

AutoBlockTime=900           # 900 seconds  (15 minutes).
AutoBlockTries=4            # meaning that 3 Tries are allowed, the fourth trie is blocked.
AutoBlock=disabled          # default for SME Server 8
AutoBlock=enabled           # default for SME Server 9

How to tune hitrates?

db configuration setprop sshd AutoBlockTries {n} # [ignore parentheses, just enter a number]
signal-event remoteaccess-update

How to tune Blocktime?

db configuration setprop sshd AutoBlockTime {s} # [ignore parentheses, just enter a number]
signal-event remoteaccess-update

How to disable/enable SSH_Autoblock?

db configuration setprop sshd AutoBlock disabled

or:

db configuration setprop sshd AutoBlock enabled

followed by:

signal-event remoteaccess-update

How to access the AutoBlock history?

• For SME8:

cat /proc/net/ipt_recent/SSH

• For SME9:

cat /proc/net/xt_recent/SSH

the current block status

How to display the current block status for the last 100 IP addresses seen:

iptables -L SSH_Autoblock -v

How clear logs

A local system admin logged as root may clear the SSH_AutoBlock history at any time with the following:

• For SME8:

echo clear > /proc/net/ipt_recent/SSH    

• For SME9:

echo "/" > /proc/net/xt_recent/SSH

Linux Change Shell access

Use this to check any shell in the Linux system

cat /etc/shells

[root@server01 ~]# cat /etc/shells
/bin/bash
/bin/bash2
/sbin/e-smith/console
/bin/csh
/bin/false
/usr/bin/rssh
/bin/sh

Then use this to check which shell the user is using (ithk01 is the user id)

grep ithk01 /etc/passwd


Then use

chsh --shell /bin/bash ithk01


For SME Linux do this

Shell Access

• I need to give a user shell access to the SME Server.

Shell access should only be provided to users who have a *need* for it and can be trusted.

Before a user can have shell access Admin must enable ssh access at

server-manager -> Security -> Remote Access

You then enable shell access for a user by:

db accounts setprop username Shell /bin/bash
chsh -s /bin/bash username

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