cmdline/apt-key.in

   1 #!/bin/sh
   2
   3 set -e
   4 unset GREP_OPTIONS
   5 export IFS="$(printf "\n\b")"
   6
   7 MASTER_KEYRING='&keyring-master-filename;'
   8 eval "$(apt-config shell MASTER_KEYRING APT::Key::MasterKeyring)"
   9 ARCHIVE_KEYRING='&keyring-filename;'
  10 eval "$(apt-config shell ARCHIVE_KEYRING APT::Key::ArchiveKeyring)"
  11 REMOVED_KEYS='&keyring-removed-filename;'
  12 eval "$(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys)"
  13 ARCHIVE_KEYRING_URI='&keyring-uri;'
  14 eval "$(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI)"
  15
  16 aptkey_echo() { echo "$@"; }
  17
  18 requires_root() {
  19         if [ "$(id -u)" -ne 0 ]; then
  20                 echo >&2 "ERROR: This command can only be used by root."
  21                 exit 1
  22         fi
  23 }
  24
  25 command_available() {
  26     # command -v "$1" >/dev/null 2>&1 # not required by policy, see #747320
  27     # which "$1" >/dev/null 2>&1 # is in debianutils (essential) but not on non-debian systems
  28     local OLDIFS="$IFS"
  29     IFS=:
  30     for p in $PATH; do
  31         if [ -x "${p}/${1}" ]; then
  32             IFS="$OLDIFS"
  33             return 0
  34         fi
  35     done
  36     IFS="$OLDIFS"
  37     return 1
  38 }
  39
  40 escape_shell() {
  41     echo "$@" | sed -e "s#'#'\"'\"'#g"
  42 }
  43
  44 get_fingerprints_of_keyring() {
  45     aptkey_execute "$GPG_SH" --keyring "$1" --with-colons --fingerprint | while read publine; do
  46         # search for a public key
  47         if [ "${publine%%:*}" != 'pub' ]; then continue; fi
  48         # search for the associated fingerprint (should be the very next line)
  49         while read fprline; do
  50            if [ "${fprline%%:*}" = 'sub' ]; then break; # should never happen
  51            elif [ "${fprline%%:*}" != 'fpr' ]; then continue; fi
  52            echo "$fprline" | cut -d':' -f 10
  53         done
  54         # order in the keyring shouldn't be important
  55     done | sort
  56 }
  57
  58 add_keys_with_verify_against_master_keyring() {
  59     ADD_KEYRING="$1"
  60     MASTER="$2"
  61
  62     if [ ! -f "$ADD_KEYRING" ]; then
  63         echo >&2 "ERROR: '$ADD_KEYRING' not found"
  64         return
  65     fi
  66     if [ ! -f "$MASTER" ]; then
  67         echo >&2 "ERROR: '$MASTER' not found"
  68         return
  69     fi
  70
  71     # when adding new keys, make sure that the archive-master-keyring
  72     # is honored. so:
  73     #   all keys that are exported must have a valid signature
  74     #   from a key in the $distro-master-keyring
  75     add_keys="$(get_fingerprints_of_keyring "$ADD_KEYRING")"
  76     all_add_keys="$(aptkey_execute "$GPG_SH" --keyring "$ADD_KEYRING" --with-colons --list-keys | grep ^[ps]ub | cut -d: -f5)"
  77     master_keys="$(aptkey_execute "$GPG_SH" --keyring "$MASTER" --with-colons --list-keys | grep ^pub | cut -d: -f5)"
  78
  79     # ensure there are no colisions LP: #857472
  80     for all_add_key in $all_add_keys; do
  81         for master_key in $master_keys; do
  82             if [ "$all_add_key" = "$master_key" ]; then
  83                 echo >&2 "Keyid collision for '$all_add_key' detected, operation aborted"
  84                 return 1
  85             fi
  86         done
  87     done
  88
  89     for add_key in $add_keys; do
  90         # export the add keyring one-by-one
  91         local TMP_KEYRING="${GPGHOMEDIR}/tmp-keyring.gpg"
  92         aptkey_execute "$GPG_SH" --batch --yes --keyring "$ADD_KEYRING" --output "$TMP_KEYRING" --export "$add_key"
  93         if ! aptkey_execute "$GPG_SH" --batch --yes --keyring "$TMP_KEYRING" --import "$MASTER" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
  94             cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
  95             false
  96         fi
  97         # check if signed with the master key and only add in this case
  98         ADDED=0
  99         for master_key in $master_keys; do
 100             if aptkey_execute "$GPG_SH" --keyring "$TMP_KEYRING" --check-sigs --with-colons "$add_key" \
 101                | grep '^sig:!:' | cut -d: -f5 | grep -q "$master_key"; then
 102                 aptkey_execute "$GPG_SH" --batch --yes --keyring "$ADD_KEYRING" --export "$add_key" \
 103                    | aptkey_execute "$GPG" --batch --yes --import
 104                 ADDED=1
 105             fi
 106         done
 107         if [ $ADDED = 0 ]; then
 108             echo >&2 "Key '$add_key' not added. It is not signed with a master key"
 109         fi
 110         rm -f "${TMP_KEYRING}"
 111     done
 112 }
 113
 114 # update the current archive signing keyring from a network URI
 115 # the archive-keyring keys needs to be signed with the master key
 116 # (otherwise it does not make sense from a security POV)
 117 net_update() {
 118     local APT_DIR='/'
 119     eval $(apt-config shell APT_DIR Dir)
 120
 121     # Disabled for now as code is insecure (LP: #1013639 (and 857472, 1013128))
 122     APT_KEY_NET_UPDATE_ENABLED=""
 123     eval $(apt-config shell APT_KEY_NET_UPDATE_ENABLED APT::Key::Net-Update-Enabled)
 124     if [ -z "$APT_KEY_NET_UPDATE_ENABLED" ]; then
 125         exit 1
 126     fi
 127
 128     if [ -z "$ARCHIVE_KEYRING_URI" ]; then
 129         echo >&2 "ERROR: Your distribution is not supported in net-update as no uri for the archive-keyring is set"
 130         exit 1
 131     fi
 132     # in theory we would need to depend on wget for this, but this feature
 133     # isn't useable in debian anyway as we have no keyring uri nor a master key
 134     if ! command_available 'wget'; then
 135         echo >&2 "ERROR: an installed wget is required for a network-based update"
 136         exit 1
 137     fi
 138     if [ ! -d "${APT_DIR}/var/lib/apt/keyrings" ]; then
 139         mkdir -p "${APT_DIR}/var/lib/apt/keyrings"
 140     fi
 141     keyring="${APT_DIR}/var/lib/apt/keyrings/$(basename "$ARCHIVE_KEYRING_URI")"
 142     old_mtime=0
 143     if [ -e $keyring ]; then
 144         old_mtime=$(stat -c %Y "$keyring")
 145     fi
 146     (cd  "${APT_DIR}/var/lib/apt/keyrings"; wget --timeout=90 -q -N "$ARCHIVE_KEYRING_URI")
 147     if [ ! -e "$keyring" ]; then
 148         return
 149     fi
 150     new_mtime=$(stat -c %Y "$keyring")
 151     if [ $new_mtime -ne $old_mtime ]; then
 152         aptkey_echo "Checking for new archive signing keys now"
 153         add_keys_with_verify_against_master_keyring "$keyring" "$MASTER_KEYRING"
 154     fi
 155 }
 156
 157 update() {
 158     if [ ! -f "$ARCHIVE_KEYRING" ]; then
 159         echo >&2 "ERROR: Can't find the archive-keyring"
 160         echo >&2 "Is the &keyring-package; package installed?"
 161         exit 1
 162     fi
 163
 164     # add new keys from the package;
 165
 166     # we do not use add_keys_with_verify_against_master_keyring here,
 167     # because "update" is run on regular package updates.  A
 168     # attacker might as well replace the master-archive-keyring file
 169     # in the package and add his own keys. so this check wouldn't
 170     # add any security. we *need* this check on net-update though
 171     import_keyring_into_keyring "$ARCHIVE_KEYRING" '' && cat "${GPGHOMEDIR}/gpgoutput.log"
 172
 173     if [ -r "$REMOVED_KEYS" ]; then
 174         # remove no-longer supported/used keys
 175         get_fingerprints_of_keyring "$REMOVED_KEYS" | while read key; do
 176             foreach_keyring_do 'remove_key_from_keyring' "$key"
 177         done
 178     else
 179         echo >&2 "Warning: removed keys keyring  $REMOVED_KEYS missing or not readable"
 180     fi
 181 }
 182
 183 remove_key_from_keyring() {
 184     local KEYRINGFILE="$1"
 185     shift
 186     # non-existent keyrings have by definition no keys
 187     if [ ! -e "$KEYRINGFILE" ]; then
 188        return
 189     fi
 190
 191     for KEY in "$@"; do
 192         local FINGERPRINTS="${GPGHOMEDIR}/keyringfile.keylst"
 193         get_fingerprints_of_keyring "$KEYRINGFILE" > "$FINGERPRINTS"
 194
 195         # strip leading 0x, if present:
 196         KEY="${KEY#0x}"
 197
 198         # check if the key is in this keyring
 199         if ! grep -iq "^[0-9A-F]*${KEY}$" "$FINGERPRINTS"; then
 200             continue
 201         fi
 202         if [ ! -w "$KEYRINGFILE" ]; then
 203             echo >&2 "Key ${KEY} is in keyring ${KEYRINGFILE}, but can't be removed as it is read only."
 204             continue
 205         fi
 206         # check if it is the only key in the keyring and if so remove the keyring altogether
 207         if [ '1' = "$(uniq "$FINGERPRINTS" | wc -l)" ]; then
 208             mv -f "$KEYRINGFILE" "${KEYRINGFILE}~" # behave like gpg
 209             return
 210         fi
 211         # we can't just modify pointed to files as these might be in /usr or something
 212         local REALTARGET
 213         if [ -L "$KEYRINGFILE" ]; then
 214             REALTARGET="$(readlink -f "$KEYRINGFILE")"
 215             mv -f "$KEYRINGFILE" "${KEYRINGFILE}.dpkg-tmp"
 216             cp -a "$REALTARGET" "$KEYRINGFILE"
 217         fi
 218         # delete the key from the keyring
 219         aptkey_execute "$GPG_SH" --keyring "$KEYRINGFILE" --batch --delete-keys --yes "$KEY"
 220         if [ -n "$REALTARGET" ]; then
 221             # the real backup is the old link, not the copy we made
 222             mv -f "${KEYRINGFILE}.dpkg-tmp" "${KEYRINGFILE}~"
 223         fi
 224     done
 225 }
 226
 227 accessible_file_exists() {
 228    if ! test -s "$1"; then
 229       return 1
 230    fi
 231    if test -r "$1"; then
 232       return 0
 233    fi
 234    warn "The key(s) in the keyring $1 are ignored as the file is not readable by user '$USER' executing apt-key."
 235    return 1
 236 }
 237
 238 foreach_keyring_do() {
 239    local ACTION="$1"
 240    shift
 241    # if a --keyring was given, just work on this one
 242    if [ -n "$FORCED_KEYRING" ]; then
 243         $ACTION "$FORCED_KEYRING" "$@"
 244    else
 245         # otherwise all known keyrings are up for inspection
 246         if accessible_file_exists "$TRUSTEDFILE"; then
 247             $ACTION "$TRUSTEDFILE" "$@"
 248         fi
 249         local TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
 250         eval "$(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)"
 251         if [ -d "$TRUSTEDPARTS" ]; then
 252             TRUSTEDPARTS="$(readlink -f "$TRUSTEDPARTS")"
 253             local TRUSTEDPARTSLIST="$(cd /; find "$TRUSTEDPARTS" -mindepth 1 -maxdepth 1 -name '*.gpg')"
 254             for trusted in $(echo "$TRUSTEDPARTSLIST" | sort); do
 255                 if accessible_file_exists "$trusted"; then
 256                     $ACTION "$trusted" "$@"
 257                 fi
 258             done
 259         fi
 260    fi
 261 }
 262
 263 run_cmd_on_keyring() {
 264     local KEYRINGFILE="$1"
 265     shift
 266     # fingerprint and co will fail if key isn't in this keyring
 267     aptkey_execute "$GPG_SH" --keyring "$KEYRINGFILE" --batch "$@" 2>/dev/null || true
 268 }
 269
 270 import_keyring_into_keyring() {
 271     local FROM="${1:-${GPGHOMEDIR}/pubring.gpg}"
 272     local TO="${2:-${GPGHOMEDIR}/pubring.gpg}"
 273     shift 2
 274     rm -f "${GPGHOMEDIR}/gpgoutput.log"
 275     # the idea is simple: We take keys from one keyring and copy it to another
 276     # we do this with so many checks in between to ensure that WE control the
 277     # creation, so we know that the (potentially) created $TO keyring is a
 278     # simple keyring rather than a keybox as gpg2 would create it which in turn
 279     # can't be read by gpgv.
 280     # BEWARE: This is designed more in the way to work with the current
 281     # callers, than to have a well defined it would be easy to add new callers to.
 282     if [ ! -s "$TO" ]; then
 283         if [ -s "$FROM" ]; then
 284             if [ -z "$2" ]; then
 285                 if ! aptkey_execute "$GPG_SH" --keyring "$FROM" --export ${1:+"$1"} > "$TO" 2> "${GPGHOMEDIR}/gpgoutput.log"; then
 286                     cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 287                     false
 288                 else
 289                     chmod 0644 -- "$TO"
 290                 fi
 291             else
 292                 create_new_keyring "$TO"
 293             fi
 294         else
 295             create_new_keyring "$TO"
 296         fi
 297     elif [ -s "$FROM" ]; then
 298         local EXPORTLIMIT="$1"
 299         if [ -n "$1$2" ]; then shift; fi
 300         if ! aptkey_execute "$GPG_SH" --keyring "$FROM" --export ${EXPORTLIMIT:+"$EXPORTLIMIT"} \
 301            | aptkey_execute "$GPG_SH" --keyring "$TO" --batch --import "$@" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
 302             cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 303             false
 304         fi
 305     fi
 306 }
 307
 308 catfile() {
 309    cat "$1" >> "$2"
 310 }
 311
 312 merge_all_trusted_keyrings_into_pubring() {
 313     # does the same as:
 314     # foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg"
 315     # but without using gpg, just cat and find
 316     local PUBRING="$(readlink -f "${GPGHOMEDIR}/pubring.gpg")"
 317     rm -f "$PUBRING"
 318     touch "$PUBRING"
 319     foreach_keyring_do 'catfile' "$PUBRING"
 320 }
 321
 322 import_keys_from_keyring() {
 323     import_keyring_into_keyring "$1" "$2"
 324 }
 325
 326 merge_keys_into_keyrings() {
 327     import_keyring_into_keyring "$2" "$1" '' --import-options 'merge-only'
 328 }
 329
 330 merge_back_changes() {
 331     if [ -n "$FORCED_KEYRING" ]; then
 332         # if the keyring was forced merge is already done
 333         return
 334     fi
 335     if [ -s "${GPGHOMEDIR}/pubring.gpg" ]; then
 336         # merge all updated keys
 337         foreach_keyring_do 'merge_keys_into_keyrings' "${GPGHOMEDIR}/pubring.gpg"
 338     fi
 339     # look for keys which were added or removed
 340     get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.orig.gpg" > "${GPGHOMEDIR}/pubring.orig.keylst"
 341     get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.gpg" > "${GPGHOMEDIR}/pubring.keylst"
 342     comm -3 "${GPGHOMEDIR}/pubring.keylst" "${GPGHOMEDIR}/pubring.orig.keylst" > "${GPGHOMEDIR}/pubring.diff"
 343     # key isn't part of new keyring, so remove
 344     cut -f 2 "${GPGHOMEDIR}/pubring.diff" | while read key; do
 345         if [ -z "$key" ]; then continue; fi
 346         foreach_keyring_do 'remove_key_from_keyring' "$key"
 347     done
 348     # key is only part of new keyring, so we need to import it
 349     cut -f 1 "${GPGHOMEDIR}/pubring.diff" | while read key; do
 350         if [ -z "$key" ]; then continue; fi
 351         import_keyring_into_keyring '' "$TRUSTEDFILE" "$key"
 352     done
 353 }
 354
 355 setup_merged_keyring() {
 356     if [ -n "$FORCED_KEYID" ]; then
 357         merge_all_trusted_keyrings_into_pubring
 358         FORCED_KEYRING="${GPGHOMEDIR}/forcedkeyid.gpg"
 359         TRUSTEDFILE="${FORCED_KEYRING}"
 360         echo "#!/bin/sh
 361 exec sh '($(escape_shell "${GPG}")' --keyring '$(escape_shell "${TRUSTEDFILE}")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 362         GPG="${GPGHOMEDIR}/gpg.1.sh"
 363         # ignore error as this "just" means we haven't found the forced keyid and the keyring will be empty
 364         import_keyring_into_keyring '' "$TRUSTEDFILE" "$FORCED_KEYID" || true
 365     elif [ -z "$FORCED_KEYRING" ]; then
 366         merge_all_trusted_keyrings_into_pubring
 367         if [ -r "${GPGHOMEDIR}/pubring.gpg" ]; then
 368             cp -a "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
 369         else
 370            touch "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
 371         fi
 372         echo "#!/bin/sh
 373 exec sh '$(escape_shell "${GPG}")' --keyring '$(escape_shell "${GPGHOMEDIR}/pubring.gpg")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 374         GPG="${GPGHOMEDIR}/gpg.1.sh"
 375     else
 376         create_new_keyring "$TRUSTEDFILE"
 377         echo "#!/bin/sh
 378 exec sh '$(escape_shell "${GPG}")' --keyring '$(escape_shell "${TRUSTEDFILE}")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 379         GPG="${GPGHOMEDIR}/gpg.1.sh"
 380     fi
 381 }
 382
 383 create_new_keyring() {
 384     # gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead.
 385     if ! [ -e "$TRUSTEDFILE" ]; then
 386         if [ -w "$(dirname "$TRUSTEDFILE")" ]; then
 387             touch -- "$TRUSTEDFILE"
 388             chmod 0644 -- "$TRUSTEDFILE"
 389         fi
 390     fi
 391 }
 392
 393 aptkey_execute() { sh "$@"; }
 394
 395 usage() {
 396     echo "Usage: apt-key [--keyring file] [command] [arguments]"
 397     echo
 398     echo "Manage apt's list of trusted keys"
 399     echo
 400     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
 401     echo "  apt-key del <keyid>         - remove the key <keyid>"
 402     echo "  apt-key export <keyid>      - output the key <keyid>"
 403     echo "  apt-key exportall           - output all trusted keys"
 404     echo "  apt-key update              - update keys using the keyring package"
 405     echo "  apt-key net-update          - update keys using the network"
 406     echo "  apt-key list                - list keys"
 407     echo "  apt-key finger              - list fingerprints"
 408     echo "  apt-key adv                 - pass advanced options to gpg (download key)"
 409     echo
 410     echo "If no specific keyring file is given the command applies to all keyring files."
 411 }
 412
 413 while [ -n "$1" ]; do
 414    case "$1" in
 415       --keyring)
 416          shift
 417          TRUSTEDFILE="$1"
 418          FORCED_KEYRING="$1"
 419          ;;
 420       --keyid)
 421          shift
 422          FORCED_KEYID="$1"
 423          ;;
 424       --secret-keyring)
 425          shift
 426          FORCED_SECRET_KEYRING="$1"
 427          ;;
 428       --readonly)
 429          merge_back_changes() { true; }
 430          create_new_keyring() { if [ ! -r "$FORCED_KEYRING" ]; then TRUSTEDFILE='/dev/null'; FORCED_KEYRING="$TRUSTEDFILE"; fi; }
 431          ;;
 432       --fakeroot)
 433          requires_root() { true; }
 434          ;;
 435       --quiet)
 436          aptkey_echo() { true; }
 437          ;;
 438       --debug1)
 439          # some cmds like finger redirect stderr to /dev/null …
 440         aptkey_execute() { echo 'EXEC:' "$@"; sh "$@"; }
 441         ;;
 442       --debug2)
 443          # … other more complicated ones pipe gpg into gpg.
 444         aptkey_execute() { echo >&2 'EXEC:' "$@"; sh "$@"; }
 445         ;;
 446       --*)
 447          echo >&2 "Unknown option: $1"
 448          usage
 449          exit 1;;
 450       *)
 451          break;;
 452    esac
 453    shift
 454 done
 455
 456 if [ -z "$TRUSTEDFILE" ]; then
 457    TRUSTEDFILE="/etc/apt/trusted.gpg"
 458    eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
 459    eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
 460 fi
 461
 462 command="$1"
 463 if [ -z "$command" ]; then
 464     usage
 465     exit 1
 466 fi
 467 shift
 468
 469 find_gpgv_status_fd() {
 470    while [ -n "$1" ]; do
 471         if [ "$1" = '--status-fd' ]; then
 472                 shift
 473                 echo "$1"
 474                 break
 475         fi
 476         shift
 477    done
 478 }
 479 GPGSTATUSFD="$(find_gpgv_status_fd "$@")"
 480
 481 warn() {
 482     echo >&2 'W:' "$@"
 483     if [ -n "$GPGSTATUSFD" ]; then
 484         echo >&${GPGSTATUSFD} '[APTKEY:] WARNING' "$@"
 485     fi
 486 }
 487
 488 create_gpg_home() {
 489     # gpg needs (in different versions more or less) files to function correctly,
 490     # so we give it its own homedir and generate some valid content for it later on
 491     if [ -n "$TMPDIR" ]; then
 492         # tmpdir is a directory and current user has rwx access to it
 493         # same tests as in apt-pkg/contrib/fileutl.cc GetTempDir()
 494         if [ ! -d "$TMPDIR" ] || [ ! -r "$TMPDIR" ] || [ ! -w "$TMPDIR" ] || [ ! -x "$TMPDIR" ]; then
 495             unset TMPDIR
 496         fi
 497     fi
 498     GPGHOMEDIR="$(mktemp -d)"
 499     CURRENTTRAP="${CURRENTTRAP} rm -rf '$(escape_shell "${GPGHOMEDIR}")';"
 500     trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
 501     chmod 700 "$GPGHOMEDIR"
 502 }
 503
 504 prepare_gpg_home() {
 505     eval "$(apt-config shell GPG_EXE Apt::Key::gpgcommand)"
 506
 507     if [ -n "$GPG_EXE" ] && command_available "$GPG_EXE"; then
 508         true
 509     elif command_available 'gpg'; then
 510         GPG_EXE="gpg"
 511     elif command_available 'gpg2'; then
 512         GPG_EXE="gpg2"
 513     else
 514         echo >&2 "Error: gnupg or gnupg2 do not seem to be installed,"
 515         echo >&2 "Error: but apt-key requires gnupg or gnupg2 for this operation."
 516         echo >&2
 517         exit 255
 518     fi
 519
 520     create_gpg_home
 521
 522     # create the trustdb with an (empty) dummy keyring
 523     # older gpgs required it, newer gpgs even warn that it isn't needed,
 524     # but require it nonetheless for some commands, so we just play safe
 525     # here for the foreseeable future and create a dummy one
 526     touch "${GPGHOMEDIR}/empty.gpg"
 527     if ! "$GPG_EXE" --ignore-time-conflict --no-options --no-default-keyring \
 528        --homedir "$GPGHOMEDIR" --quiet --check-trustdb --keyring "${GPGHOMEDIR}/empty.gpg" >"${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
 529        cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 530        false
 531     fi
 532
 533     # now tell gpg that it shouldn't try to maintain this trustdb file
 534     echo "#!/bin/sh
 535 exec '$(escape_shell "${GPG_EXE}")' --ignore-time-conflict --no-options --no-default-keyring \\
 536 --homedir '$(escape_shell "${GPGHOMEDIR}")' --no-auto-check-trustdb --trust-model always \"\$@\"" > "${GPGHOMEDIR}/gpg.0.sh"
 537     GPG_SH="${GPGHOMEDIR}/gpg.0.sh"
 538     GPG="$GPG_SH"
 539
 540     # We don't usually need a secret keyring, of course, but
 541     # for advanced operations, we might really need a secret keyring after all
 542     if [ -n "$FORCED_SECRET_KEYRING" ] && [ -r "$FORCED_SECRET_KEYRING" ]; then
 543         if ! aptkey_execute "$GPG" -v --batch --import "$FORCED_SECRET_KEYRING" >"${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
 544             cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 545             false
 546         fi
 547     else
 548        # and then, there are older versions of gpg which panic and implode
 549        # if there isn't one available - and writeable for imports
 550        # and even if not output is littered with the creation of a secring,
 551        # so lets call import once to have it create what it wants in silence
 552        echo -n | aptkey_execute "$GPG" --batch --import >/dev/null 2>&1 || true
 553     fi
 554 }
 555
 556 if [ "$command" != 'help' ] && [ "$command" != 'verify' ]; then
 557     prepare_gpg_home
 558 fi
 559
 560 case "$command" in
 561     add)
 562         requires_root
 563         setup_merged_keyring
 564         aptkey_execute "$GPG" --quiet --batch --import "$@"
 565         merge_back_changes
 566         aptkey_echo "OK"
 567         ;;
 568     del|rm|remove)
 569         requires_root
 570         foreach_keyring_do 'remove_key_from_keyring' "$@"
 571         aptkey_echo "OK"
 572         ;;
 573     update)
 574         requires_root
 575         setup_merged_keyring
 576         update
 577         merge_back_changes
 578         ;;
 579     net-update)
 580         requires_root
 581         setup_merged_keyring
 582         net_update
 583         merge_back_changes
 584         ;;
 585     list)
 586         foreach_keyring_do 'run_cmd_on_keyring' --list-keys "$@"
 587         ;;
 588     finger*)
 589         foreach_keyring_do 'run_cmd_on_keyring' --fingerprint "$@"
 590         ;;
 591     export|exportall)
 592         merge_all_trusted_keyrings_into_pubring
 593         aptkey_execute "$GPG_SH" --keyring "${GPGHOMEDIR}/pubring.gpg" --armor --export "$@"
 594         ;;
 595     adv*)
 596         setup_merged_keyring
 597         aptkey_echo "Executing: $GPG $*"
 598         aptkey_execute "$GPG" "$@"
 599         merge_back_changes
 600         ;;
 601     verify)
 602         GPGV=''
 603         eval $(apt-config shell GPGV Apt::Key::gpgvcommand)
 604         if [ -n "$GPGV" ] && command_available "$GPGV"; then true;
 605         elif command_available 'gpgv'; then GPGV='gpgv';
 606         elif command_available 'gpgv2'; then GPGV='gpgv2';
 607         else
 608            echo >&2 'ERROR: gpgv or gpgv2 required for verification'
 609            exit 29
 610         fi
 611         # for a forced keyid we need gpg --export, so full wrapping required
 612         if [ -n "$FORCED_KEYID" ]; then
 613             prepare_gpg_home
 614         else
 615             create_gpg_home
 616         fi
 617         setup_merged_keyring
 618         if [ -n "$FORCED_KEYRING" ]; then
 619             "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "${FORCED_KEYRING}" --ignore-time-conflict "$@"
 620         else
 621             "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "${GPGHOMEDIR}/pubring.gpg" --ignore-time-conflict "$@"
 622         fi
 623         ;;
 624     help)
 625         usage
 626         ;;
 627     *)
 628         usage
 629         exit 1
 630         ;;
 631 esac