/mandos/trunk

To get this branch, use:
bzr branch /loggerhead/mandos/trunk
953 by Teddy Hogeborn
Adapt to changes in cryptsetup; use "cryptroot-unlock" program
1
#!/bin/sh
2
# 
3
# Script to get password from plugin-runner to cryptroot-unlock
4
# 
5
# Copyright © 2018 Teddy Hogeborn
6
# Copyright © 2018 Björn Påhlsson
7
# 
8
# This file is part of Mandos.
9
# 
10
# Mandos is free software: you can redistribute it and/or modify it
11
# under the terms of the GNU General Public License as published by
12
# the Free Software Foundation, either version 3 of the License, or
13
# (at your option) any later version.
14
# 
15
#     Mandos is distributed in the hope that it will be useful, but
16
#     WITHOUT ANY WARRANTY; without even the implied warranty of
17
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18
#     GNU General Public License for more details.
19
# 
20
# You should have received a copy of the GNU General Public License
21
# along with Mandos.  If not, see <http://www.gnu.org/licenses/>.
22
# 
23
# Contact the authors at <mandos@recompile.se>.
24
25
# This script is made to run in the initramfs, and must not be run in
26
# the normal system environment.
27
28
# Temporary file for the password
29
passfile=$(mktemp -p /run -t mandos.XXXXXX)
30
trap "rm -f -- $passfile 2>/dev/null" EXIT
31
32
# Disable the plugins which conflict with "askpass" as distributed by
33
# cryptsetup.
34
cat <<-EOF >>/conf/conf.d/mandos/plugin-runner.conf
35
36
	--disable=askpass-fifo
37
	--disable=password-prompt
38
	--disable=plymouth
39
EOF
40
41
# In case a password is retrieved by other means than by plugin-runner
42
# (such as typing it on the console into the prompt given by the
43
# "askpass" program), this dummy plugin will be made to exit
44
# successfully, thereby forcing plugin-runner to stop all its plugins
45
# and also exit itself.
46
cat <<-EOF > /lib/mandos/plugins.d/dummy
47
	#!/bin/sh
48
	
49
	while [ -e /run/mandos-keep-running ]; do
50
	    sleep 1
51
	done
52
	
53
	# exit successfully to force plugin-runner to finish
54
	exit 0
55
EOF
56
chmod u=rwx,go=rx /lib/mandos/plugins.d/dummy
57
58
# This file is the flag which keeps the dummy plugin running
59
touch /run/mandos-keep-running
60
61
# Keep running plugin-runner and trying any password, until either a
62
# password is accepted by cryptroot-unlock, or plugin-runner fails, or
63
# the file /run/mandos-keep-running has been removed.
1122 by Teddy Hogeborn
Fix bashisms: Use "command -v" instead of "type"
64
while command -v cryptroot-unlock >/dev/null 2>&1; do
953 by Teddy Hogeborn
Adapt to changes in cryptsetup; use "cryptroot-unlock" program
65
    /lib/mandos/plugin-runner > "$passfile" &
66
    echo $! > /run/mandos-plugin-runner.pid
67
    wait %% || break
68
69
    # Try this password ten times (or ten seconds)
70
    for loop in 1 2 3 4 5 6 7 8 9 10; do
71
	if [ -e /run/mandos-keep-running ]; then
72
	    cryptroot-unlock < "$passfile" >/dev/null 2>&1 && break 2
73
	    sleep 1
74
	else
75
	    break 2
76
	fi
77
    done
78
done
79
80
exec >/dev/null 2>&1
81
82
rm -f /run/mandos-plugin-runner.pid /run/mandos-keep-running