| 1 | #!/bin/sh |
| 2 | #env; exit 0 |
| 3 | |
| 4 | jail_dir="/var/chroot-jails" |
| 5 | jail_system="/var/chroot-sys" |
| 6 | |
| 7 | user="$PAM_USER" |
| 8 | home="$(getent passwd "$user" | cut -f6 -d:)" |
| 9 | home_system="$jail_system/$home" |
| 10 | home_chroot="$jail_dir/$user/$home"; |
| 11 | |
| 12 | echo "$PAM_USER, $PAM_SERVICE, $PAM_TTY, $PAM_RHOST, $PAM_TYPE" |
| 13 | |
| 14 | [ "$user" = "root" ] && { |
| 15 | echo "no chroots for roots" |
| 16 | exit 0; |
| 17 | } |
| 18 | |
| 19 | #TODO: test if $home is in /home/ |
| 20 | |
| 21 | mkdir -p "$home_system" |
| 22 | mkdir -p "$jail_dir/$user" |
| 23 | chown "$user:$user" "$home_system" |
| 24 | chown -R root:root "$jail_system" |
| 25 | |
| 26 | function is_mounted() { |
| 27 | dir=$(echo "$1" | sed -e 's/\/\/*/\//g; s/\/$//g;') |
| 28 | cut -d ' ' -f 2 /proc/mounts | grep "^$dir$" >/dev/null |
| 29 | } |
| 30 | |
| 31 | function bind() { |
| 32 | from="$1" |
| 33 | to="$2" |
| 34 | opt="$3" |
| 35 | |
| 36 | is_mounted "$to" || { |
| 37 | echo "Mounting: $from to $to"; |
| 38 | mount -o bind "$from" "$to" |
| 39 | } |
| 40 | [ -n "$opt" ] && mount -o remount,bind,"$opt" "$to" |
| 41 | is_mounted "$to" || { |
| 42 | echo "Not mounted: $to" |
| 43 | return 1 |
| 44 | } |
| 45 | return 0 |
| 46 | } |
| 47 | |
| 48 | case "$PAM_TYPE" in |
| 49 | close_session) |
| 50 | #TODO: unmount if not busy |
| 51 | #umount "$jail_dir/$user" && umount "$home_chroot" |
| 52 | exit 0 |
| 53 | ;; |
| 54 | *) |
| 55 | bind "$jail_system" "$jail_dir/$user" ',ro' || exit 1 |
| 56 | bind "$home" "$home_chroot" || exit 2 |
| 57 | ;; |
| 58 | esac |
| 59 | |
| 60 | exit 0 |