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