User Management (Wheezy)

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At best, there's me, and one or two people I'm training, who actually have shell access.

So I make my user settings pretty global.

Users and Groups

Some of this stuff is discussed in various relevant sections as well.

addgroup --gid 70 wheel
addgroup --gid 72 hugepager
addgroup --gid 999 vmail
useradd -d /var/vmail -s /usr/sbin/nologin -g 999 -r -u 999 --disabled-password --gecos "" vmail
usermod -a -G adm,cdrom,audio,src,staff,games,users,wheel adminusernamehere
usermod -a -G wheel root

Adding wheel to root for stuff like ninja.

/etc/bash.bashrc

# Enable completion
shopt -s histappend
HISTCONTROL=ignoreboth
HISTFILESIZE=65536
HISTSIZE=256
# There is a point at which either just typing it
# again or looking through the file is more productive...

/etc/profile.d/ls.sh

# Colors and aliasing
# Prefer to set this up as an 'include' instead. Easier to make
# alias changes that I may be using across a large number of accounts.
# Check for interactive bash
[ -z "$BASH_VERSION" -o -z "$PS1" ] && return
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto -A'
    alias l='ls --color=auto -la'
else
    alias ls='ls -A'
    alias l='ls -la'
fi

Default /etc/skel

mkdir /etc/skel/.ssh
touch /etc/skel/authorized_keys
chmod 640 /etc/skel/.bash_logout /etc/skel/.bashrc /etc/skel/.profile /etc/skel/.toprc /etc/skel/.ssh/authorized_keys
chmod 750 /etc/skel/.ssh/ /etc/skel/

I also add my own public key to authorized_keys here.

/etc/skel/.toprc

RCfile for "top with windows"           # shameless braggin'
Id:a, Mode_altscr=0, Mode_irixps=1, Delay_time=0.500, Curwin=2
Def     fieldscur=ABEGHIOPSQTNWKMcdfJLrUVYZX
        winflags=64808, sortindx=0, maxtasks=0
        summclr=1, msgsclr=1, headclr=3, taskclr=1
Job     fieldscur=ABcefgjlrstuvyzMKNHIWOPQDX
        winflags=64825, sortindx=0, maxtasks=0
        summclr=6, msgsclr=6, headclr=7, taskclr=1
Mem     fieldscur=ABGCNOPQRSTUVdefJlMyzWHIKX
        winflags=64808, sortindx=2, maxtasks=0
        summclr=2, msgsclr=1, headclr=6, taskclr=1
Usr     fieldscur=ABDECGfhijlopqrstuvyzMKNWX
        winflags=62777, sortindx=4, maxtasks=0
        summclr=3, msgsclr=3, headclr=2, taskclr=3

I am addicted to my personal top settings. Maybe should see a therapist.


/etc/skel/.bashrc

# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples
# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac
# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.
if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi
# Get your fortune cookie!
# Place here so user can nuke/edit as desired.
# Probably should fix cowsay to handle line breaks better.
if [ -f /usr/games/fortune ]; then
  if [ -f /usr/games/cowsay ]; then
    /usr/games/fortune -a | /usr/games/cowsay -W 75 -p
  else
    /usr/games/fortune -a
  fi
fi

/root/.bashrc

While I copy other skeleton files to root/admin users, a separate .bashrc file is nice even if some of the reason for it is legacy. The talking cow does get a bit annoying bouncing in and out of root all the time.

# ~/.bashrc: executed by bash(1) for non-login shells.
#When restarting mysql, the memlock value gets taken from root's limits, so if we
#are more restrictive, hugepage allocation will fail.
ulimit -l 33554432
ulimit -n 65536
# If not running interactively, don't do anything further
case $- in
    *i*) ;;
      *) return;;
esac
# Alias definitions.
# I like using nologin for most users, but this can make maintenance difficult, so...
alias sub="su -s /bin/bash"
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.
if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

/etc/webskel

A web skeleton file to help simplify site deployment.

cp -R /etc/skel /etc/webskel
mkdir /etc/webskel/logs
mkdir /etc/webskel/docs
mkdir /etc/webskel/priv
touch /etc/webskel/.viminfo
chmod 640 /etc/webskel/.viminfo
chmod 750 /etc/webskel/logs /etc/webskel/docs /etc/webskel/priv
  • /etc/webskel/.ssh/authorized_keys
    • add no-agent-forwarding,no-port-forwarding,no-pty,no-user-rc,no-X11-forwarding before ssh-rsa for each key, as well as when you add user keys.
cp /etc/adduser.conf /etc/webuser.conf
  • /etc/webuser.conf:
    • DSHELL=/usr/sbin/nologin
    • SKEL=/etc/webskel


User adding scripts

Because it's all about typing fewer characters.

/root/secadd.sh

#!/bin/sh
# This is for adding other administrative users, special
# accounts (e.g. for minecraft or git) and so on.
if [ $1 ] ; then
  /usr/sbin/adduser --gecos "" $1
  /bin/chmod 0750 /home/$1
else
  echo "Usage: secadd.sh username"
fi

/root/webadd.sh

#!/bin/sh
# This still doesn't do everything it should. Need to flesh it out more.
if [ $1 ] ; then
  /usr/sbin/adduser --shell /usr/sbin/nologin --disabled-password --gecos "" --conf /etc/webuser.conf $1
  /bin/sed "s/USERNAME/$1/g" /root/fpmnginx.conf > /etc/nginx/sites/$1.conf
  /bin/sed "s/USERNAME/$1/" /root/fpmpool.conf > /etc/php5/fpm/pool.d/$1.conf
  /bin/chmod 0751 /home/$1
  /bin/chown root /home/$1
  /bin/chown root /home/$1/.ssh
  /bin/chown root /home/$1/.ssh/authorized_keys
  /bin/chgrp www-data /home/$1/docs
  /etc/init.d/php5-fpm reload
else
  echo "Usage: webadd.sh username"
fi

This makes use of the templates we make in other parts of the guide, applying them accordingly. It prepares the account for chrooted sftp access, but you still need to add

Match User accountname
   ChrootDirectory /home/accountname
   AllowTCPForwarding no
   X11Forwarding no
   ForceCommand internal-sftp

to /etc/ssh/sshd_config accordingly. Have not gotten around to properly automating this.

While the nginx config is connected to fpm properly, you still need to assign an IP address and call it.