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1#!/bin/sh
2
3set -e
dac074b0 4unset GREP_OPTIONS
b3d44315 5
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6# We don't use a secret keyring, of course, but gpg panics and
7# implodes if there isn't one available
8
9129f2af 9GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg"
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10GPG="$GPG_CMD --keyring /etc/apt/trusted.gpg"
11
12
e779ece4 13MASTER_KEYRING=/usr/share/keyrings/ubuntu-master-keyring.gpg
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14ARCHIVE_KEYRING=/usr/share/keyrings/ubuntu-archive-keyring.gpg
15REMOVED_KEYS=/usr/share/keyrings/ubuntu-archive-removed-keys.gpg
fd9a8ca2 16ARCHIVE_KEYRING_URI=http://archive.ubuntu.com/ubuntu/project/ubuntu-archive-keyring.gpg
4a242c5b 17
7fbe42c0 18add_keys_with_verify_against_master_keyring() {
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19 ADD_KEYRING=$1
20 MASTER=$2
21
22 if [ ! -f "$ADD_KEYRING" ]; then
23 echo "ERROR: '$ADD_KEYRING' not found"
24 return
25 fi
26 if [ ! -f "$MASTER" ]; then
27 echo "ERROR: '$MASTER' not found"
28 return
29 fi
30
31 # when adding new keys, make sure that the archive-master-keyring
32 # is honored. so:
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33 # all keys that are exported must have a valid signature
34 # from a key in the $distro-master-keyring
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35 add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
36 master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5`
37 for add_key in $add_keys; do
c9bb37c7 38 ADDED=0
8c56b1e0 39 for master_key in $master_keys; do
c9bb37c7 40 if $GPG_CMD --keyring $ADD_KEYRING --list-sigs --with-colons $add_key | grep ^sig | cut -d: -f5 | grep -q $master_key; then
3916f941 41 $GPG_CMD --quiet --batch --keyring $ADD_KEYRING --export $add_key | $GPG --import
c9bb37c7 42 ADDED=1
8c56b1e0 43 fi
7fbe42c0 44 done
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45 if [ $ADDED = 0 ]; then
46 echo >&2 "Key '$add_key' not added. It is not signed with a master key"
47 fi
8c56b1e0 48 done
7fbe42c0 49}
4a242c5b 50
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51# update the current archive signing keyring from a network URI
52# the archive-keyring keys needs to be signed with the master key
53# (otherwise it does not make sense from a security POV)
54net_update() {
55 if [ -z "$ARCHIVE_KEYRING_URI" ]; then
56 echo "ERROR: no location for the archive-keyring given"
57 fi
58 if [ ! -d /var/lib/apt/keyrings ]; then
59 mkdir -p /var/lib/apt/keyrings
60 fi
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61 keyring=/var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING)
62 old_mtime=0
63 if [ -e $keyring ]; then
64 old_mtime=$(stat -c %Y $keyring)
65 fi
848ecfa4 66 (cd /var/lib/apt/keyrings; wget -q -N $ARCHIVE_KEYRING_URI)
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67 if [ ! -e $keyring ]; then
68 return
69 fi
70 new_mtime=$(stat -c %Y $keyring)
71 if [ $new_mtime -ne $old_mtime ]; then
8dd0686e 72 echo "Checking for new archive signing keys now"
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73 add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING
74 fi
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75}
76
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77update() {
78 if [ ! -f $ARCHIVE_KEYRING ]; then
79 echo >&2 "ERROR: Can't find the archive-keyring"
c6c31f62 80 echo >&2 "Is the ubuntu-keyring package installed?"
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81 exit 1
82 fi
83
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84 # add new keys from the package;
85
86 # we do not use add_keys_with_verify_against_master_keyring here,
87 # because we "update" is run on regular package updates. A
88 # attacker might as well replace the master-archive-keyring file
89 # in the package and add his own keys. so this check wouldn't
90 # add any security. we *need* this check on net-update though
91 $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
4a242c5b 92
7fbe42c0 93 # remove no-longer supported/used keys
3036f1e4 94 keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5`
4a242c5b 95 for key in $keys; do
3036f1e4 96 if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then
32133629 97 $GPG --quiet --batch --delete-key --yes ${key}
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98 fi
99 done
100}
101
7fbe42c0 102
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103usage() {
104 echo "Usage: apt-key [command] [arguments]"
105 echo
106 echo "Manage apt's list of trusted keys"
107 echo
108 echo " apt-key add <file> - add the key contained in <file> ('-' for stdin)"
109 echo " apt-key del <keyid> - remove the key <keyid>"
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110 echo " apt-key export <keyid> - output the key <keyid>"
111 echo " apt-key exportall - output all trusted keys"
4a242c5b 112 echo " apt-key update - update keys using the keyring package"
848ecfa4 113 echo " apt-key net-update - update keys using the network"
b3d44315 114 echo " apt-key list - list keys"
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115 echo " apt-key finger - list fingerprints"
116 echo " apt-key adv - pass advanced options to gpg (download key)"
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117 echo
118}
119
120command="$1"
121if [ -z "$command" ]; then
122 usage
123 exit 1
124fi
125shift
126
127if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
128 echo >&2 "Warning: gnupg does not seem to be installed."
129 echo >&2 "Warning: apt-key requires gnupg for most operations."
130 echo >&2
131fi
132
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133case "$command" in
134 add)
135 $GPG --quiet --batch --import "$1"
136 echo "OK"
137 ;;
138 del|rm|remove)
139 $GPG --quiet --batch --delete-key --yes "$1"
140 echo "OK"
141 ;;
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142 update)
143 update
144 ;;
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145 net-update)
146 net_update
147 ;;
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148 list)
149 $GPG --batch --list-keys
150 ;;
151 finger*)
152 $GPG --batch --fingerprint
153 ;;
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154 export)
155 $GPG --armor --export "$1"
156 ;;
157 exportall)
158 $GPG --armor --export
159 ;;
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160 adv*)
161 echo "Executing: $GPG $*"
162 $GPG $*
163 ;;
164 help)
165 usage
166 ;;
167 *)
168 usage
169 exit 1
170 ;;
171esac