cmdline/apt-key

   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=/usr/share/keyrings/ubuntu-master-keyring.gpg
  13 ARCHIVE_KEYRING=/usr/share/keyrings/ubuntu-archive-keyring.gpg
  14 REMOVED_KEYS=/usr/share/keyrings/ubuntu-archive-removed-keys.gpg
  15 ARCHIVE_KEYRING_URI=http://archive.ubuntu.com/ubuntu/ubuntu-archive-keyring.gpg
  16
  17 add_keys_with_verify_against_master_keyring() {
  18     ADD_KEYRING=$1
  19     MASTER=$2
  20
  21     if [ ! -f "$ADD_KEYRING" ]; then
  22         echo "ERROR: '$ADD_KEYRING' not found"
  23         return
  24     fi
  25     if [ ! -f "$MASTER" ]; then
  26         echo "ERROR: '$MASTER' not found"
  27         return
  28     fi
  29
  30     # when adding new keys, make sure that the archive-master-keyring
  31     # is honored. so:
  32     #   all keys that are exported and have the name
  33     #   "Ubuntu Archive Automatic Signing Key" must have a valid signature
  34     #   from a key in the ubuntu-master-keyring
  35     add_keys=`$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
  38         ADDED=0
  39         for master_key in $master_keys; do
  40             if $GPG_CMD --keyring $ADD_KEYRING --list-sigs --with-colons $add_key | grep ^sig | cut -d: -f5 | grep -q $master_key; then
  41                 $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export $add_key | $GPG --import
  42                 ADDED=1
  43             fi
  44         done
  45         if [ $ADDED = 0 ]; then
  46             echo >&2 "Key '$add_key' not added. It is not signed with a master key"
  47         fi
  48     done
  49 }
  50
  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)
  54 net_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
  61     (cd  /var/lib/apt/keyrings; wget -q -N $ARCHIVE_KEYRING_URI)
  62     add_keys_with_verify_against_master_keyring /var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING) $MASTER_KEYRING
  63 }
  64
  65 update() {
  66     if [ ! -f $ARCHIVE_KEYRING ]; then
  67         echo >&2 "ERROR: Can't find the archive-keyring"
  68         echo >&2 "Is the ubuntu-keyring package installed?"
  69         exit 1
  70     fi
  71
  72     # add new keys, if no MASTER_KEYRING is used, use the traditional
  73     # way
  74     if [ -z "$MASTER_KEYRING" ]; then
  75         $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
  76     else
  77         add_keys_with_verify_against_master_keyring $ARCHIVE_KEYRING $MASTER_KEYRING
  78     fi
  79
  80     # remove no-longer supported/used keys
  81     keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5`
  82     for key in $keys; do
  83         if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then
  84             $GPG --quiet --batch --delete-key --yes ${key}
  85         fi
  86     done
  87 }
  88
  89
  90 usage() {
  91     echo "Usage: apt-key [command] [arguments]"
  92     echo
  93     echo "Manage apt's list of trusted keys"
  94     echo
  95     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
  96     echo "  apt-key del <keyid>         - remove the key <keyid>"
  97     echo "  apt-key export <keyid>      - output the key <keyid>"
  98     echo "  apt-key exportall           - output all trusted keys"
  99     echo "  apt-key update              - update keys using the keyring package"
 100     echo "  apt-key net-update          - update keys using the network"
 101     echo "  apt-key list                - list keys"
 102     echo
 103 }
 104
 105 command="$1"
 106 if [ -z "$command" ]; then
 107     usage
 108     exit 1
 109 fi
 110 shift
 111
 112 if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
 113     echo >&2 "Warning: gnupg does not seem to be installed."
 114     echo >&2 "Warning: apt-key requires gnupg for most operations."
 115     echo >&2
 116 fi
 117
 118 case "$command" in
 119     add)
 120         $GPG --quiet --batch --import "$1"
 121         echo "OK"
 122         ;;
 123     del|rm|remove)
 124         $GPG --quiet --batch --delete-key --yes "$1"
 125         echo "OK"
 126         ;;
 127     update)
 128         update
 129         ;;
 130     net-update)
 131         net_update
 132         ;;
 133     list)
 134         $GPG --batch --list-keys
 135         ;;
 136     finger*)
 137         $GPG --batch --fingerprint
 138         ;;
 139     export)
 140         $GPG --armor --export "$1"
 141         ;;
 142     exportall)
 143         $GPG --armor --export
 144         ;;
 145     adv*)
 146         echo "Executing: $GPG $*"
 147         $GPG $*
 148         ;;
 149     help)
 150         usage
 151         ;;
 152     *)
 153         usage
 154         exit 1
 155         ;;
 156 esac