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Commit | Line | Data |
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8d07ddab | 1 | #!/bin/sh |
8d07ddab | 2 | # geninitrd mod: cryptsetup luks |
6e49b0b1 | 3 | USE_LUKS=${USE_LUKS:-yes} |
8d07ddab ER |
4 | |
5 | # true if root device is crypted with cryptsetup luks | |
6 | # and we should init cryptsetup luks at boot | |
7 | have_luks=no | |
8 | ||
8d07ddab | 9 | # device to use for name for cryptsetup luks |
704c497d | 10 | LUKSNAME="" |
8d07ddab | 11 | |
c124d0cf ER |
12 | # setup geninitrd module |
13 | # @access public | |
14 | setup_mod_luks() { | |
15 | cryptsetup=$(find_tool $initrd_dir/cryptsetup /sbin/cryptsetup-initrd) | |
6e49b0b1 ER |
16 | |
17 | if [ ! -x /sbin/cryptsetup ] || [ ! -x "$cryptsetup" ]; then | |
c124d0cf ER |
18 | USE_LUKS=no |
19 | fi | |
20 | } | |
21 | ||
8d07ddab ER |
22 | # return true if node is cryptsetup luks encrypted |
23 | # @param string $node device node to be examined | |
24 | # @access public | |
25 | is_luks() { | |
26 | local node="$1" | |
f7385874 ER |
27 | |
28 | # luks not wanted | |
29 | if is_no "$USE_LUKS"; then | |
30 | return 1 | |
31 | fi | |
32 | ||
a5b35f50 | 33 | local dev dm_name=${node#/dev/mapper/} |
8d07ddab | 34 | if [ "$node" = "$dm_name" ]; then |
02ba8ab7 | 35 | verbose "is_luks: $node is not device mapper name" |
8d07ddab ER |
36 | return 1 |
37 | fi | |
b892656c ER |
38 | |
39 | dev=$(awk -vdm_name="$dm_name" '$1 == dm_name { print $2 }' /etc/crypttab) | |
1d96f045 | 40 | if [ "$dev" ]; then |
52c1e558 | 41 | dev=$(find_devname "$dev") |
1d96f045 ER |
42 | /sbin/cryptsetup isLuks $dev |
43 | rc=$? | |
44 | else | |
a5b35f50 | 45 | rc=1 |
1d96f045 | 46 | fi |
8d07ddab ER |
47 | |
48 | if [ $rc = 0 ]; then | |
02ba8ab7 | 49 | verbose "is_luks: $node is cryptsetup luks" |
8d07ddab | 50 | else |
02ba8ab7 | 51 | verbose "is_luks: $node is not cryptsetup luks" |
8d07ddab ER |
52 | fi |
53 | return $rc | |
54 | } | |
55 | ||
56 | # find modules for $devpath | |
57 | # @param $devpath device to be examined | |
58 | # @access public | |
59 | find_modules_luks() { | |
60 | local devpath="$1" | |
704c497d | 61 | local dev="" |
f4dd815d | 62 | |
704c497d | 63 | LUKSNAME=${devpath#/dev/mapper/} |
8d07ddab | 64 | |
b02a6b13 | 65 | find_module "dm-crypt" |
8d07ddab ER |
66 | |
67 | # TODO: autodetect | |
b02a6b13 ER |
68 | find_module "aes" |
69 | find_module "cbc" | |
32b9509d AM |
70 | find_module "-af-alg" |
71 | find_module "-algif_hash" | |
72 | find_module "-algif_skcipher" | |
73 | find_module "-loop" | |
8d07ddab | 74 | |
8d07ddab | 75 | # recurse |
b892656c ER |
76 | dev=$(awk -vLUKSNAME="$LUKSNAME" '$1 == LUKSNAME { print $2 }' /etc/crypttab) |
77 | if [ -n "$dev" ]; then | |
52c1e558 | 78 | dev=$(find_devname "$dev") |
704c497d JK |
79 | find_modules_for_devpath $dev |
80 | have_luks=yes | |
81 | else | |
82 | die "Cannot find '$LUKSNAME' in /etc/crypttab" | |
83 | fi | |
8d07ddab ER |
84 | } |
85 | ||
86 | ||
87 | # generate initrd fragment for cryptsetup luks init | |
88 | # @access public | |
89 | initrd_gen_luks() { | |
1b481849 ER |
90 | if ! is_yes "$have_luks"; then |
91 | return | |
92 | fi | |
93 | ||
8d07ddab | 94 | inst_d /bin |
684d5d2a | 95 | inst_exec $cryptsetup /bin/cryptsetup |
99634b92 | 96 | inst_d /var/run/cryptsetup |
8d07ddab ER |
97 | |
98 | mount_dev | |
99 | mount_sys | |
100 | initrd_gen_devices | |
101 | # TODO: 'udevadm settle' is called by lukssetup, is udev optional? | |
102 | ||
02ba8ab7 | 103 | verbose "luks: process /etc/crypttab $LUKSNAME" |
704c497d | 104 | luks_crypttab $LUKSNAME |
8d07ddab ER |
105 | } |
106 | ||
107 | ||
108 | # PRIVATE METHODS | |
109 | key_is_random() { | |
110 | [ "$1" = "/dev/urandom" -o "$1" = "/dev/hw_random" -o "$1" = "/dev/random" ] | |
111 | } | |
112 | ||
113 | # produce cryptsetup from $name from /etc/crypttab | |
114 | luks_crypttab() { | |
704c497d | 115 | local LUKSNAME="$1" |
8d07ddab ER |
116 | |
117 | # copy from /etc/rc.d/init.d/cryptsetup | |
118 | local dst src key opt mode owner | |
119 | ||
120 | while read dst src key opt; do | |
704c497d | 121 | [ "$dst" != "$LUKSNAME" ] && continue |
8d07ddab ER |
122 | |
123 | if [ -n "$key" -a "x$key" != "xnone" ]; then | |
124 | if test -e "$key" ; then | |
125 | mode=$(LC_ALL=C ls -l "$key" | cut -c 5-10) | |
126 | owner=$(LC_ALL=C ls -l $key | awk '{ print $3 }') | |
127 | if [ "$mode" != "------" ] && ! key_is_random "$key"; then | |
128 | die "INSECURE MODE FOR $key" | |
129 | fi | |
130 | if [ "$owner" != root ]; then | |
131 | die "INSECURE OWNER FOR $key" | |
132 | fi | |
133 | else | |
134 | die "Key file for $dst not found" | |
135 | fi | |
136 | else | |
137 | key="" | |
138 | fi | |
139 | ||
52c1e558 | 140 | src=$(find_devname "$src") |
8d07ddab ER |
141 | if /sbin/cryptsetup isLuks "$src" 2>/dev/null; then |
142 | if key_is_random "$key"; then | |
143 | die "$dst: LUKS requires non-random key, skipping" | |
144 | fi | |
8d07ddab ER |
145 | if [ "$key" ]; then |
146 | keyfile=/etc/.$dst.key | |
147 | inst $key $keyfile | |
148 | fi | |
149 | ||
7fcd846e AM |
150 | crypttab_opt="" |
151 | old_IFS="$IFS" | |
152 | IFS="," | |
153 | for option in $opt; do | |
154 | case "$option" in | |
155 | discard|allow-discards) | |
156 | crypttab_opt="$crypttab_opt --allow-discards" | |
157 | ;; | |
158 | *) | |
159 | warn "$dst: option \'$opt\' is invalid for LUKS partitions, ignored" | |
160 | ;; | |
161 | esac | |
162 | done | |
163 | IFS="$old_IFS" | |
164 | ||
ad5033d7 | 165 | verbose "+ cryptsetup ${keyfile:+-d $keyfile} open $crypttab_opt '$src' '$dst'" |
8d07ddab | 166 | add_linuxrc <<-EOF |
932f5d44 AM |
167 | debugshell |
168 | ||
169 | cryptsetup_opt="" | |
170 | if [ "\$DEBUGINITRD" ]; then | |
171 | cryptsetup_opt="--debug" | |
172 | fi | |
2fcb6fc5 AM |
173 | # cryptsetup can be called twice and in case on crypt on lvm only second |
174 | # will succeed because there will be no src device in first cryptsetup call | |
175 | # this can be called multiple times, before lvm and after lvm. | |
cb006694 AF |
176 | luksdev='$src' |
177 | if [ \${luksdev##/dev/disk/by-uuid/} != \${luksdev} ]; then | |
178 | src_uuid=\${luksdev##/dev/disk/by-uuid/} | |
179 | while read x y z name; do | |
932f5d44 | 180 | found_uuid=\$(cryptsetup \$cryptsetup_opt luksUUID /dev/\${name} 2>/dev/null) |
cb006694 AF |
181 | if [ "\$found_uuid" = "\$src_uuid" ]; then |
182 | luksdev=/dev/\$name | |
183 | break | |
184 | fi | |
185 | done < /proc/partitions | |
186 | fi | |
187 | ||
188 | if [ -e "\$luksdev" ]; then | |
932f5d44 | 189 | crypt_status=\$(cryptsetup \$cryptsetup_opt status '$dst') |
4fa03792 | 190 | if [ "\${crypt_status%%is inactive*}" != "\$crypt_status" ]; then |
2fcb6fc5 | 191 | # is inactive |
ad5033d7 | 192 | cryptsetup \$cryptsetup_opt ${keyfile:+-d $keyfile} open $crypttab_opt "\$luksdev" '$dst' <&1 |
2fcb6fc5 | 193 | fi |
abce1a7f | 194 | fi |
8d07ddab ER |
195 | |
196 | debugshell | |
197 | EOF | |
198 | else | |
199 | die "$dst: only LUKS encryption supported" | |
200 | fi | |
201 | done < /etc/crypttab | |
202 | } |