| 1 | #! /bin/sh |
| 2 | |
| 3 | set -e |
| 4 | |
| 5 | quis=${0##*/} |
| 6 | |
| 7 | usage="usage: $quis [-nqv] HOST ..." |
| 8 | |
| 9 | verbose=nil |
| 10 | noact=nil |
| 11 | while getopts "hnvq" opt; do |
| 12 | case "$opt" in |
| 13 | h) echo "$usage"; exit ;; |
| 14 | n) noact=t verbose=t ;; |
| 15 | v) verbose=t ;; |
| 16 | q) verbose=nil ;; |
| 17 | *) echo >&2 "$usage"; exit 1 ;; |
| 18 | esac |
| 19 | done |
| 20 | shift $(( $OPTIND - 1 )) |
| 21 | |
| 22 | case $# in 0) echo "$usage"; exit 1 ;; esac |
| 23 | |
| 24 | defrun=' |
| 25 | run () { |
| 26 | case $verbose in t) echo >&2 "- $*" ;; esac |
| 27 | case $noact in nil) "$@" ;; esac |
| 28 | }' |
| 29 | eval "$defrun" |
| 30 | |
| 31 | if getent group backup >/dev/null; then |
| 32 | echo >&2 "$quis: group \`backup' already exists" |
| 33 | else |
| 34 | run addgroup --gid 200 backup |
| 35 | fi |
| 36 | |
| 37 | for host in "$@"; do |
| 38 | |
| 39 | if getent passwd bkp-$host >/dev/null; then |
| 40 | echo >&2 "$quis: backup user \`bkp-$host' already exists" |
| 41 | else |
| 42 | uid=201 |
| 43 | while { getent passwd $uid || getent group $uid; } >/dev/null; do |
| 44 | uid=$(( $uid + 1 )) |
| 45 | done |
| 46 | run addgroup --system --gid $uid bkp-$host |
| 47 | run adduser --system --uid $uid --gid $uid \ |
| 48 | --home /var/lib/bkp/$host \ |
| 49 | --shell /bin/bash \ |
| 50 | --gecos "Backup user for host $host" \ |
| 51 | --disabled-password \ |
| 52 | bkp-$host |
| 53 | fi |
| 54 | |
| 55 | getent group backup | { |
| 56 | IFS=: read name passwd gid members |
| 57 | case ",$members," in |
| 58 | ",bkp-$host,") |
| 59 | echo >&2 "$quis: user \`bkp-$host' already in group \`backup'" |
| 60 | ;; |
| 61 | *) |
| 62 | run adduser bkp-$host backup |
| 63 | ;; |
| 64 | esac |
| 65 | } |
| 66 | |
| 67 | settings="verbose=$verbose noact=$noact" |
| 68 | run mkdir -p -m755 /var/lib/bkp/$host/.ssh |
| 69 | ssh root@$host "$settings; $defrun" ' |
| 70 | cd $HOME |
| 71 | mkdir -p -m755 .ssh |
| 72 | cd .ssh |
| 73 | if [ ! -f id_rsa.pub ]; then |
| 74 | genp=t |
| 75 | else |
| 76 | genp=$( |
| 77 | ssh-keygen -l -fid_rsa.pub | { |
| 78 | read bits fpr fname type |
| 79 | case "$bits,$type" in |
| 80 | *[!0-9]*,*) |
| 81 | echo t |
| 82 | ;; |
| 83 | *,"(RSA)") |
| 84 | if [ $bits -ge 3072 ]; then echo nil; else echo t; fi |
| 85 | ;; |
| 86 | *) |
| 87 | echo t |
| 88 | ;; |
| 89 | esac |
| 90 | } |
| 91 | ) |
| 92 | fi |
| 93 | |
| 94 | case $genp in |
| 95 | t) |
| 96 | run ssh-keygen -trsa -fid_rsa -b3072 -N "" |
| 97 | ;; |
| 98 | esac |
| 99 | ' |
| 100 | run scp root@$host:.ssh/id_rsa.pub /var/lib/bkp/$host/.ssh/authorized_keys |
| 101 | |
| 102 | done |