cmdline/apt-key

   1 #!/bin/sh
   2
   3 set -e
   4 unset GREP_OPTIONS
   5
   6 # We don't use a secret keyring, of course, but gpg panics and
   7 # implodes if there isn't one available
   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"
  10
  11 MASTER_KEYRING=/usr/share/keyrings/ubuntu-master-keyring.gpg
  12 ARCHIVE_KEYRING=/usr/share/keyrings/ubuntu-archive-keyring.gpg
  13 REMOVED_KEYS=/usr/share/keyrings/ubuntu-archive-removed-keys.gpg
  14 ARCHIVE_KEYRING_URI=http://archive.ubuntu.com/ubuntu/project/ubuntu-archive-keyring.gpg
  15
  16 add_keys_with_verify_against_master_keyring() {
  17     ADD_KEYRING=$1
  18     MASTER=$2
  19
  20     if [ ! -f "$ADD_KEYRING" ]; then
  21         echo "ERROR: '$ADD_KEYRING' not found"
  22         return
  23     fi
  24     if [ ! -f "$MASTER" ]; then
  25         echo "ERROR: '$MASTER' not found"
  26         return
  27     fi
  28
  29     # when adding new keys, make sure that the archive-master-keyring
  30     # is honored. so:
  31     #   all keys that are exported must have a valid signature
  32     #   from a key in the $distro-master-keyring
  33     add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
  34     master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5`
  35     for add_key in $add_keys; do
  36         ADDED=0
  37         for master_key in $master_keys; do
  38             if $GPG_CMD --keyring $ADD_KEYRING --list-sigs --with-colons $add_key | grep ^sig | cut -d: -f5 | grep -q $master_key; then
  39                 $GPG_CMD --quiet --batch --keyring $ADD_KEYRING --export $add_key | $GPG --import
  40                 ADDED=1
  41             fi
  42         done
  43         if [ $ADDED = 0 ]; then
  44             echo >&2 "Key '$add_key' not added. It is not signed with a master key"
  45         fi
  46     done
  47 }
  48
  49 # update the current archive signing keyring from a network URI
  50 # the archive-keyring keys needs to be signed with the master key
  51 # (otherwise it does not make sense from a security POV)
  52 net_update() {
  53     if [ -z "$ARCHIVE_KEYRING_URI" ]; then
  54         echo "ERROR: no location for the archive-keyring given"
  55         exit 1
  56     fi
  57     # in theory we would need to depend on wget for this, but this feature
  58     # isn't useable in debian anyway as we have no keyring uri nor a master key
  59     if ! which wget >/dev/null 2>&1; then
  60         echo "ERROR: an installed wget is required for a network-based update"
  61         exit 1
  62     fi
  63     if [ ! -d /var/lib/apt/keyrings ]; then
  64         mkdir -p /var/lib/apt/keyrings
  65     fi
  66     keyring=/var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING)
  67     old_mtime=0
  68     if [ -e $keyring ]; then
  69         old_mtime=$(stat -c %Y $keyring)
  70     fi
  71     (cd  /var/lib/apt/keyrings; wget -q -N $ARCHIVE_KEYRING_URI)
  72     if [ ! -e $keyring ]; then
  73         return
  74     fi
  75     new_mtime=$(stat -c %Y $keyring)
  76     if [ $new_mtime -ne $old_mtime ]; then
  77         echo "Checking for new archive signing keys now"
  78         add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING
  79     fi
  80 }
  81
  82 update() {
  83     if [ ! -f $ARCHIVE_KEYRING ]; then
  84         echo >&2 "ERROR: Can't find the archive-keyring"
  85         echo >&2 "Is the ubuntu-keyring package installed?"
  86         exit 1
  87     fi
  88
  89     # add new keys from the package;
  90
  91     # we do not use add_keys_with_verify_against_master_keyring here,
  92     # because we "update" is run on regular package updates.  A
  93     # attacker might as well replace the master-archive-keyring file
  94     # in the package and add his own keys. so this check wouldn't
  95     # add any security. we *need* this check on net-update though
  96     $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
  97
  98     if [ -r "$REMOVED_KEYS" ]; then
  99         # remove no-longer supported/used keys
 100         keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5`
 101         for key in $keys; do
 102             if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then
 103                 $GPG --quiet --batch --delete-key --yes ${key}
 104             fi
 105         done
 106     else
 107         echo "Warning: removed keys keyring  $REMOVED_KEYS missing or not readable" >&2
 108     fi
 109 }
 110
 111
 112 usage() {
 113     echo "Usage: apt-key [--keyring file] [command] [arguments]"
 114     echo
 115     echo "Manage apt's list of trusted keys"
 116     echo
 117     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
 118     echo "  apt-key del <keyid>         - remove the key <keyid>"
 119     echo "  apt-key export <keyid>      - output the key <keyid>"
 120     echo "  apt-key exportall           - output all trusted keys"
 121     echo "  apt-key update              - update keys using the keyring package"
 122     echo "  apt-key net-update          - update keys using the network"
 123     echo "  apt-key list                - list keys"
 124     echo "  apt-key finger              - list fingerprints"
 125     echo "  apt-key adv                 - pass advanced options to gpg (download key)"
 126     echo
 127     echo "If no specific keyring file is given the command applies to all keyring files."
 128 }
 129
 130 # Determine on which keyring we want to work
 131 if [ "$1" = "--keyring" ]; then
 132         #echo "keyfile given"
 133         shift
 134         TRUSTEDFILE="$1"
 135         if [ -r "$TRUSTEDFILE" ]; then
 136                 GPG="$GPG --keyring $TRUSTEDFILE --primary-keyring $TRUSTEDFILE"
 137         else
 138                 echo >&2 "Error: The specified keyring »$TRUSTEDFILE« is missing or not readable"
 139                 exit 1
 140         fi
 141         shift
 142 # otherwise use the default
 143 else
 144         #echo "generate list"
 145         TRUSTEDFILE="/etc/apt/trusted.gpg"
 146         if [ -r "$TRUSTEDFILE" ]; then
 147                 GPG="$GPG --keyring $TRUSTEDFILE"
 148         fi
 149         GPG="$GPG --primary-keyring $TRUSTEDFILE"
 150         TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
 151         if [ -d "$TRUSTEDPARTS" ]; then
 152                 #echo "parts active"
 153                 for trusted in $(run-parts --list $TRUSTEDPARTS --regex '^.*\.gpg$'); do
 154                         #echo "part -> $trusted"
 155                         GPG="$GPG --keyring $trusted"
 156                 done
 157         fi
 158 fi
 159 #echo "COMMAND: $GPG"
 160
 161 command="$1"
 162 if [ -z "$command" ]; then
 163     usage
 164     exit 1
 165 fi
 166 shift
 167
 168 if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
 169     echo >&2 "Warning: gnupg does not seem to be installed."
 170     echo >&2 "Warning: apt-key requires gnupg for most operations."
 171     echo >&2
 172 fi
 173
 174 case "$command" in
 175     add)
 176         $GPG --quiet --batch --import "$1"
 177         echo "OK"
 178         ;;
 179     del|rm|remove)
 180         $GPG --quiet --batch --delete-key --yes "$1"
 181         echo "OK"
 182         ;;
 183     update)
 184         update
 185         ;;
 186     net-update)
 187         net_update
 188         ;;
 189     list)
 190         $GPG --batch --list-keys
 191         ;;
 192     finger*)
 193         $GPG --batch --fingerprint
 194         ;;
 195     export)
 196         $GPG --armor --export "$1"
 197         ;;
 198     exportall)
 199         $GPG --armor --export
 200         ;;
 201     adv*)
 202         echo "Executing: $GPG $*"
 203         $GPG $*
 204         ;;
 205     help)
 206         usage
 207         ;;
 208     *)
 209         usage
 210         exit 1
 211         ;;
 212 esac