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     (cd  /var/lib/apt/keyrings; wget -q -N $ARCHIVE_KEYRING_URI)
  65     add_keys_with_verify_against_master_keyring /var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING) $MASTER_KEYRING
  66 }
  67
  68 update() {
  69     if [ ! -f $ARCHIVE_KEYRING ]; then
  70         echo >&2 "ERROR: Can't find the archive-keyring"
  71         echo >&2 "Is the debian-archive-keyring package installed?"
  72         exit 1
  73     fi
  74
  75     # add new keys, if no MASTER_KEYRING is used, use the traditional
  76     # way
  77     if [ -z "$MASTER_KEYRING" ]; then
  78         $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
  79     else
  80         add_keys_with_verify_against_master_keyring $ARCHIVE_KEYRING $MASTER_KEYRING
  81     fi
  82
  83     # remove no-longer supported/used keys
  84     keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5`
  85     for key in $keys; do
  86         if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then
  87             $GPG --quiet --batch --delete-key --yes ${key}
  88         fi
  89     done
  90 }
  91
  92
  93 usage() {
  94     echo "Usage: apt-key [command] [arguments]"
  95     echo
  96     echo "Manage apt's list of trusted keys"
  97     echo
  98     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
  99     echo "  apt-key del <keyid>         - remove the key <keyid>"
 100     echo "  apt-key export <keyid>      - output the key <keyid>"
 101     echo "  apt-key exportall           - output all trusted keys"
 102     echo "  apt-key update              - update keys using the keyring package"
 103     echo "  apt-key net-update          - update keys using the network"
 104     echo "  apt-key list                - list keys"
 105     echo
 106 }
 107
 108 command="$1"
 109 if [ -z "$command" ]; then
 110     usage
 111     exit 1
 112 fi
 113 shift
 114
 115 if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
 116     echo >&2 "Warning: gnupg does not seem to be installed."
 117     echo >&2 "Warning: apt-key requires gnupg for most operations."
 118     echo >&2
 119 fi
 120
 121 case "$command" in
 122     add)
 123         $GPG --quiet --batch --import "$1"
 124         echo "OK"
 125         ;;
 126     del|rm|remove)
 127         $GPG --quiet --batch --delete-key --yes "$1"
 128         echo "OK"
 129         ;;
 130     update)
 131         update
 132         ;;
 133     net-update)
 134         net_update
 135         ;;
 136     list)
 137         $GPG --batch --list-keys
 138         ;;
 139     finger*)
 140         $GPG --batch --fingerprint
 141         ;;
 142     export)
 143         $GPG --armor --export "$1"
 144         ;;
 145     exportall)
 146         $GPG --armor --export
 147         ;;
 148     adv*)
 149         echo "Executing: $GPG $*"
 150         $GPG $*
 151         ;;
 152     help)
 153         usage
 154         ;;
 155     *)
 156         usage
 157         exit 1
 158         ;;
 159 esac