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1 | #! /bin/sh |
2 | ### | |
3 | ### Generate a new recovery key and split it among keepers | |
4 | ### | |
5 | ### (c) 2011 Mark Wooding | |
6 | ### | |
7 | ||
8 | ###----- Licensing notice --------------------------------------------------- | |
9 | ### | |
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10 | ### This file is part of the distorted.org.uk key management suite. |
11 | ### | |
12 | ### distorted-keys is free software; you can redistribute it and/or modify | |
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13 | ### it under the terms of the GNU General Public License as published by |
14 | ### the Free Software Foundation; either version 2 of the License, or | |
15 | ### (at your option) any later version. | |
16 | ### | |
599c8f75 | 17 | ### distorted-keys is distributed in the hope that it will be useful, |
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18 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ### GNU General Public License for more details. | |
21 | ### | |
22 | ### You should have received a copy of the GNU General Public License | |
599c8f75 | 23 | ### along with distorted-keys; if not, write to the Free Software Foundation, |
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24 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | ||
26 | set -e | |
27 | case "${KEYSLIB+t}" in t) ;; *) echo >&2 "$0: KEYSLIB unset"; exit 1 ;; esac | |
28 | . "$KEYSLIB"/keyfunc.sh | |
29 | ||
30 | defhelp <<HELP | |
c47f2aba | 31 | [-p PROFILE] RECOV [KEEPER:K ...] [-- OPTION=VALUE ...] |
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32 | Generate a new recovery secret, and split it among the available keepers. |
33 | ||
34 | The new secret will be called RECOV. For each KEEPER set, the private key | |
35 | wil be split into shares, and encrypted with the KEEPER's public keys; any K | |
36 | of these shares can be used to reveal the original key. | |
37 | ||
38 | If there is already a recovery key called RECOV then it will be rolled over. | |
39 | The previous key must already be revealed. If KEEPERs are listed, these | |
40 | replace the existing keeper sets; otherwise the same keepers as before are | |
41 | used. | |
42 | ||
43 | If there is not a recovery key called RECOV then at least one keeper set must | |
44 | be specified. | |
45 | HELP | |
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46 | |
47 | ## Parse the command line. | |
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48 | profile=${recov_profile-recovery} |
49 | while getopts "p:" opt; do | |
50 | case "$opt" in | |
51 | p) profile=$OPTARG ;; | |
52 | *) usage_err ;; | |
53 | esac | |
54 | done | |
55 | shift $(( $OPTIND - 1 )) | |
56 | case $# in 0) usage_err ;; esac | |
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57 | recov=$1; shift |
58 | checkword "recovery key label" "$recov" | |
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59 | checkword "profile label" "$profile" |
60 | nkeep=0 | |
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61 | for k in "$@"; do |
62 | case "$k" in | |
c47f2aba | 63 | --) break ;; |
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64 | *:*) ;; |
65 | *) echo >&2 "$quis: bad keeper spec \`$k'"; exit 1 ;; | |
66 | esac | |
c47f2aba | 67 | keeper=${k%:*} t=${k#*:} nkeep=$(( $nkeep + 1 )) |
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68 | checkword "keeper set label" "$keeper" |
69 | checknumber "keeper quorum" "$t" | |
70 | done | |
71 | ||
72 | ## Establish the keeper parameters. | |
73 | rdir=$KEYS/recov/$recov | |
74 | if [ ! -d $rdir ]; then mkdir -m755 -p $rdir; fi | |
c47f2aba | 75 | case $nkeep in |
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76 | 0) |
77 | kparam=$rdir/keepers | |
78 | ;; | |
79 | *) | |
80 | for k in "$@"; do | |
c47f2aba | 81 | case "$k" in --) break ;; esac |
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82 | keeper=${k%:*} t=${k#*:} |
83 | echo $keeper $t | |
84 | done >$rdir/keepers.new | |
85 | kparam=$rdir/keepers.new | |
86 | ;; | |
87 | esac | |
88 | if [ ! -f $kparam ]; then echo >&2 "$quis: no keepers specified"; exit 1; fi | |
89 | ||
90 | ## Make the new key and issue the shares. | |
c47f2aba | 91 | mktmp |
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92 | rm -rf $rdir/new |
93 | mkdir -m755 $rdir/new | |
94 | cd $tmp | |
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95 | while :; do case "$#,$1" in |
96 | 0,) break ;; | |
97 | *,*,*) ;; | |
98 | *,--) break ;; | |
99 | esac | |
100 | shift | |
101 | done | |
102 | c_gensyskey $profile $rdir/new/store secret recov="$recov" | |
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103 | while read keeper k; do |
104 | read n hunoz <$KEYS/keeper/$keeper/meta | |
5c30c6e6 | 105 | $bindir/shamir issue $k/$n secret | { |
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106 | read param |
107 | echo "$param" >$rdir/new/$keeper.param | |
108 | i=0 | |
109 | while read share; do | |
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110 | c_sysencrypt $KEYS/keeper/$keeper/$i >$rdir/new/$keeper.$i.share <<EOF |
111 | $share | |
112 | EOF | |
113 | i=$(( $i + 1 )) | |
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114 | done |
115 | } | |
116 | done <$kparam | |
117 | rm -f secret | |
118 | ||
119 | ## If there's an existing instance of this key, transfer the recovery blobs. | |
120 | if [ ! -d $rdir/current ]; then | |
121 | seq=0 | |
122 | else | |
123 | seq=$(readlink $rdir/current) | |
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124 | reqsafe |
125 | reveal=$SAFE/keys.reveal/$recov.current/secret | |
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126 | if [ ! -f $reveal ]; then |
127 | echo >&2 "$quis: current $recov key not revealed" | |
128 | exit 1 | |
129 | fi | |
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130 | |
131 | find $rdir/current/ -type f -name '*.recov' -print | while read name; do | |
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132 | name=${name#$rdir/current/} |
133 | case "$name" in */*) mkdir -p -m755 $rdir/new/${name%/*} ;; esac | |
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134 | c_sysdecrypt $rdir/current/store $reveal <$rdir/current/$name >tmp |
135 | c_sysencrypt $rdir/new/store <tmp >$rdir/new/$name | |
136 | rm tmp | |
53263601 | 137 | done |
c47f2aba | 138 | rm -r $SAFE/keys.reveal/$recov.current |
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139 | fi |
140 | ||
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141 | ## Tidy up and commit. Repointing the symlink is grim because, according to |
142 | ## POSIX rules, `mv foo bar' should rename `foo' to `bar/foo' is `bar' is a | |
143 | ## symlink to a directory -- and there's no way of turning this behaviour | |
144 | ## off. The subterfuge here is due to Colin Watson. | |
53263601 | 145 | cd $rdir |
c47f2aba | 146 | while [ -d $seq ]; do seq=$(( $seq + 1 )); done |
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147 | case $kparam in *.new) mv keepers.new keepers ;; esac |
148 | rm -f next | |
149 | ln -s $seq next | |
150 | mv new $seq | |
599c8f75 | 151 | mkdir hack; mv next hack/current; mv hack/current .; rmdir hack |
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152 | |
153 | ###----- That's all, folks -------------------------------------------------- |