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=""
  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: '$MASTER' not found"
  30         return
  31     fi
  32
  33     # when adding new keys, make sure that the archive-master-keyring
  34     # is honored. so:
  35     #   all keys that are exported and have the name
  36     #   "Ubuntu Archive Automatic Signing Key" must have a valid signature
  37     #   from a key in the ubuntu-master-keyring
  38     add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
  39     master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5`
  40     for add_key in $add_keys; do
  41         ADDED=0
  42         for master_key in $master_keys; do
  43             if $GPG_CMD --keyring $ADD_KEYRING --list-sigs --with-colons $add_key | grep ^sig | cut -d: -f5 | grep -q $master_key; then
  44                 $GPG_CMD --quiet --batch --keyring $ADD_KEYRING --export $add_key | $GPG --import
  45                 ADDED=1
  46             fi
  47         done
  48         if [ $ADDED = 0 ]; then
  49             echo >&2 "Key '$add_key' not added. It is not signed with a master key"
  50         fi
  51     done
  52 }
  53
  54 # update the current archive signing keyring from a network URI
  55 # the archive-keyring keys needs to be signed with the master key
  56 # (otherwise it does not make sense from a security POV)
  57 net_update() {
  58     if [ -z "$ARCHIVE_KEYRING_URI" ]; then
  59         echo "ERROR: no location for the archive-keyring given"
  60     fi
  61     if [ ! -d /var/lib/apt/keyrings ]; then
  62         mkdir -p /var/lib/apt/keyrings
  63     fi
  64     keyring=/var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING)
  65     old_mtime=0
  66     if [ -e $keyring ]; then
  67         old_mtime=$(stat -c %Y $keyring)
  68     fi
  69     (cd  /var/lib/apt/keyrings; wget -q -N $ARCHIVE_KEYRING_URI)
  70     if [ ! -e $keyring ]; then
  71         return
  72     fi
  73     new_mtime=$(stat -c %Y $keyring)
  74     if [ $new_mtime -ne $old_mtime ]; then
  75         add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING
  76     fi
  77 }
  78
  79 update() {
  80     if [ ! -f $ARCHIVE_KEYRING ]; then
  81         echo >&2 "ERROR: Can't find the archive-keyring"
  82         echo >&2 "Is the debian-archive-keyring package installed?"
  83         exit 1
  84     fi
  85
  86     # add new keys, if no MASTER_KEYRING is used, use the traditional
  87     # way
  88     if [ -z "$MASTER_KEYRING" ]; then
  89         $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
  90     else
  91         add_keys_with_verify_against_master_keyring $ARCHIVE_KEYRING $MASTER_KEYRING
  92     fi
  93
  94     # remove no-longer supported/used keys
  95     keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5`
  96     for key in $keys; do
  97         if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then
  98             $GPG --quiet --batch --delete-key --yes ${key}
  99         fi
 100     done
 101 }
 102
 103
 104 usage() {
 105     echo "Usage: apt-key [command] [arguments]"
 106     echo
 107     echo "Manage apt's list of trusted keys"
 108     echo
 109     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
 110     echo "  apt-key del <keyid>         - remove the key <keyid>"
 111     echo "  apt-key export <keyid>      - output the key <keyid>"
 112     echo "  apt-key exportall           - output all trusted keys"
 113     echo "  apt-key update              - update keys using the keyring package"
 114     echo "  apt-key net-update          - update keys using the network"
 115     echo "  apt-key list                - list keys"
 116     echo
 117 }
 118
 119 command="$1"
 120 if [ -z "$command" ]; then
 121     usage
 122     exit 1
 123 fi
 124 shift
 125
 126 if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
 127     echo >&2 "Warning: gnupg does not seem to be installed."
 128     echo >&2 "Warning: apt-key requires gnupg for most operations."
 129     echo >&2
 130 fi
 131
 132 case "$command" in
 133     add)
 134         $GPG --quiet --batch --import "$1"
 135         echo "OK"
 136         ;;
 137     del|rm|remove)
 138         $GPG --quiet --batch --delete-key --yes "$1"
 139         echo "OK"
 140         ;;
 141     update)
 142         update
 143         ;;
 144     net-update)
 145         net_update
 146         ;;
 147     list)
 148         $GPG --batch --list-keys
 149         ;;
 150     finger*)
 151         $GPG --batch --fingerprint
 152         ;;
 153     export)
 154         $GPG --armor --export "$1"
 155         ;;
 156     exportall)
 157         $GPG --armor --export
 158         ;;
 159     adv*)
 160         echo "Executing: $GPG $*"
 161         $GPG $*
 162         ;;
 163     help)
 164         usage
 165         ;;
 166     *)
 167         usage
 168         exit 1
 169         ;;
 170 esac