Make sure EnforcePersonality runs last
[snf-image] / snf-image-helper / tasks / 40DeleteSSHKeys.in
1 #! /bin/bash
2
3 # Copyright (C) 2011 GRNET S.A. 
4 #
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 2 of the License, or
8 # (at your option) any later version.
9 #
10 # This program is distributed in the hope that it will be useful, but
11 # WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 # General Public License for more details.
14 #
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 # 02110-1301, USA.
19
20 ### BEGIN TASK INFO
21 # Provides:             DeleteSSHKeys
22 # RunBefore:            EnforcePersonality
23 # RunAfter:             MountImage
24 # Short-Description:    Remove ssh keys and in some cases recreate them
25 ### END TASK INFO
26
27 set -e
28 . "@commondir@/common.sh"
29
30 trap task_cleanup EXIT
31 report_task_start
32
33 # Check if the task should be prevented from running.
34 check_if_excluded
35
36 if [ ! -d "$SNF_IMAGE_TARGET" ]; then
37     log_error "Target dir: \`$SNF_IMAGE_TARGET' is missing."
38 fi
39
40 if [ "$SNF_IMAGE_PROPERTY_OSFAMILY" != "linux" ]; then
41     exit 0
42 fi
43
44 distro=$(get_base_distro "$SNF_IMAGE_TARGET")
45
46 HOST_KEY="/etc/ssh/ssh_host_key"
47 RSA_KEY="/etc/ssh/ssh_host_rsa_key"
48 DSA_KEY="/etc/ssh/ssh_host_dsa_key"
49 ECDSA_KEY="/etc/ssh/ssh_host_ecdsa_key"
50
51 target="$SNF_IMAGE_TARGET"
52
53 #Remove the default keys
54 for pair in "$HOST_KEY@rsa1" "$RSA_KEY@rsa" "$DSA_KEY@dsa" "$ECDSA_KEY@ecdsa"; do
55     key=$(echo $pair | cut -d@ -f1)
56     key_type=$(echo $pair | cut -d@ -f2)
57     if [ -e "$target/$key" ]; then
58         rm -f "$target/$key"{,.pub}
59         if [ "x$distro" = "xdebian" ]; then
60             chroot "$target" \
61                 env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
62                 ssh-keygen -t $key_type -q -N '' -f "$key"
63         fi
64     fi
65 done
66
67 config="$target/etc/ssh/sshd_config"
68 if [ ! -e "$config" ]; then
69     warn "Config file: \`$config' is missing."
70     warn "Can't check for non-default keys."
71     exit 0
72 fi
73
74 # Remove non-default keys...
75 grep ^HostKey "$config" || true | while read key_line; do
76     key=$(echo $key_line | cut -d" " -f2)
77     if [ "$key" = $HOST_KEY -o "$key" = $RSA_KEY -o \
78             "$key" = $DSA_KEY -o "$key" = $ECDSA_KEY ]; then
79         continue;
80     fi
81
82     if [ "x$distro" = "xdebian" ]; then
83         # Most distros recreate missing keys...debian complains
84         type=""
85         if [ -e "$target/$key" ]; then
86             if grep -e "-----BEGIN DSA PRIVATE KEY-----" "$target/$key"; then
87                 type=dsa
88             elif grep -e "-----BEGIN EC PRIVATE KEY-----" "$target/$key"; then
89                 type=ecdsa
90             elif grep -e "-----BEGIN RSA PRIVATE KEY-----" "$target/$key"; then
91                 type=rsa
92             elif grep -e "SSH PRIVATE KEY FILE FORMAT" "$target/$key"; then
93                 type=rsa1
94             fi
95         else # do some guessing...
96             for i in rsa dsa ecdsa; do
97                 if echo "$key" | grep _${i}_ > /dev/null; then
98                     type="$i";
99                     break;
100                 fi
101             done
102         fi
103         if [ -z "$type" ]; then
104             echo "Warning: Unknown key type. I'll use \`rsa1'";
105             type=rsa1
106         fi
107
108         rm -f "$target/$key"{,.pub}
109         chroot "$target" \
110             env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
111             ssh-keygen -t $type -q -N '' -f "$key"
112     else
113         rm -f "$target/$key"{,.pub}
114     fi
115 done
116
117 exit 0
118
119 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :