146 lines
3.9 KiB
Bash
Executable file
146 lines
3.9 KiB
Bash
Executable file
#!/usr/bin/bash
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# Note that this script requires "jq" to be installed and a version
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# of loginctl that accepts the "-j" option.
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while [ "$#" -gt 0 ]; do
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case "$1" in
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--path) shift; ttyPath="$1";;
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--path=*) IFS='=' read -r option value <<< "$1"; ttyPath="$value";;
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esac
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shift
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done
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ttyPath="${ttyPath:-/dev/virtio-ports/org.jdrupes.vmop_agent.0}"
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if [ ! -w "$ttyPath" ]; then
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echo >&2 "Device $ttyPath not writable"
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exit 1
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fi
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# Create fd for the tty in variable con
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if ! exec {con}<>"$ttyPath"; then
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echo >&2 "Cannot open device $ttyPath"
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exit 1
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fi
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# Temporary file for logging error messages, clear tty and signal ready
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temperr=$(mktemp)
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clear >/dev/tty1
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echo >&${con} "220 Hello"
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# This script uses the (shared) home directory as "dictonary" for
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# synchronizing the username and the uid between hosts.
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#
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# Every user has a directory with his username. The directory is
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# owned by root to prevent changes of access rights by the user.
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# The uid and gid of the directory are equal. Thus the name of the
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# directory and the id from the group ownership also provide the
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# association between the username and the uid.
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# Add the user with name $1 to the host's "user database". This
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# may not be invoked concurrently.
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createUser() {
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local missing=$1
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local uid
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local userHome="/home/$missing"
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local createOpts=""
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# Retrieve or create the uid for the username
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if [ -d "$userHome" ]; then
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# If a home directory exists, use the id from the group ownership as uid
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uid=$(ls -ldn "$userHome" | head -n 1 | awk '{print $4}')
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createOpts="--no-create-home"
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else
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# Else get the maximum of all ids from the group ownership +1
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uid=$(ls -ln "/home" | tail -n +2 | awk '{print $4}' | sort | tail -1)
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uid=$(( $uid + 1 ))
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if [ $uid -lt 1100 ]; then
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uid=1100
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fi
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createOpts="--create-home"
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fi
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groupadd -g $uid $missing
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useradd $missing -u $uid -g $uid $createOpts
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}
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# Login the user, i.e. create a desktopn for the user.
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doLogin() {
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user=$1
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if [ "$user" = "root" ]; then
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echo >&${con} "504 Won't log in root"
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return
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fi
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# Check if this user is already logged in on tty2
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curUser=$(loginctl -j | jq -r '.[] | select(.tty=="tty2") | .user')
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if [ "$curUser" = "$user" ]; then
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echo >&${con} "201 User already logged in"
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return
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fi
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# Terminate a running desktop (fail safe)
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attemptLogout
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# Check if username is known on this host. If not, create user
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uid=$(id -u ${user} 2>/dev/null)
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if [ $? != 0 ]; then
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( flock 200
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createUser ${user}
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) 200>/home/.gen-uid-lock
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# This should now work, else something went wrong
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uid=$(id -u ${user} 2>/dev/null)
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if [ $? != 0 ]; then
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echo >&${con} "451 Cannot determine uid"
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return
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fi
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fi
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# Configure user as auto login user
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sed -i '/AutomaticLogin/d' /etc/gdm/custom.conf
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sed -i '/\[daemon\]/a AutomaticLoginEnable=true\nAutomaticLogin='$user \
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/etc/gdm/custom.conf
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# Activate user
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systemctl restart gdm
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if [ $? -eq 0 ]; then
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echo >&${con} "201 User logged in successfully"
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else
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echo >&${con} "451 $(tr '\n' ' ' <${temperr})"
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fi
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}
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# Attempt to log out a user currently using tty1. This is an intermediate
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# operation that can be invoked from other operations
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attemptLogout() {
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sed -i '/AutomaticLogin/d' /etc/gdm/custom.conf
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systemctl stop gdm
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echo >&${con} "102 Desktop stopped"
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}
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# Log out any user currently using tty1. This is invoked when executing
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# the logout command and therefore sends back a 2xx return code.
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# Also try to restart gdm, if it is not running.
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doLogout() {
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attemptLogout
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systemctl restart gdm
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echo >&${con} "202 User logged out"
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}
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while read line <&${con}; do
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case $line in
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"login "*) IFS=' ' read -ra args <<< "$line"; doLogin ${args[1]};;
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"logout") doLogout;;
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esac
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done
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onExit() {
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doLogout
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if [ -n "$temperr" ]; then
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rm -f $temperr
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fi
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echo >&${con} "240 Quit"
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}
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trap onExit EXIT
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