cmdline/apt-key.in

   1 #!/bin/sh
   2
   3 set -e
   4 unset GREP_OPTIONS
   5 export IFS="$(printf "\n\b")"
   6
   7 APT_DIR="/"
   8 eval $(apt-config shell APT_DIR Dir)
   9
  10 MASTER_KEYRING='&keyring-master-filename;'
  11 eval $(apt-config shell MASTER_KEYRING APT::Key::MasterKeyring)
  12 ARCHIVE_KEYRING='&keyring-filename;'
  13 eval $(apt-config shell ARCHIVE_KEYRING APT::Key::ArchiveKeyring)
  14 REMOVED_KEYS='&keyring-removed-filename;'
  15 eval $(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys)
  16 ARCHIVE_KEYRING_URI='&keyring-uri;'
  17 eval $(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI)
  18
  19 aptkey_echo() { echo "$@"; }
  20
  21 requires_root() {
  22         if [ "$(id -u)" -ne 0 ]; then
  23                 echo >&2 "ERROR: This command can only be used by root."
  24                 exit 1
  25         fi
  26 }
  27
  28 get_fingerprints_of_keyring() {
  29     aptkey_execute "$GPG_SH" --keyring "$1" --with-colons --fingerprint | while read publine; do
  30         # search for a public key
  31         if [ "${publine%%:*}" != 'pub' ]; then continue; fi
  32         # search for the associated fingerprint (should be the very next line)
  33         while read fprline; do
  34            if [ "${fprline%%:*}" = 'sub' ]; then break; # should never happen
  35            elif [ "${fprline%%:*}" != 'fpr' ]; then continue; fi
  36            echo "$fprline" | cut -d':' -f 10
  37         done
  38         # order in the keyring shouldn't be important
  39     done | sort
  40 }
  41
  42 add_keys_with_verify_against_master_keyring() {
  43     ADD_KEYRING=$1
  44     MASTER=$2
  45
  46     if [ ! -f "$ADD_KEYRING" ]; then
  47         echo >&2 "ERROR: '$ADD_KEYRING' not found"
  48         return
  49     fi
  50     if [ ! -f "$MASTER" ]; then
  51         echo >&2 "ERROR: '$MASTER' not found"
  52         return
  53     fi
  54
  55     # when adding new keys, make sure that the archive-master-keyring
  56     # is honored. so:
  57     #   all keys that are exported must have a valid signature
  58     #   from a key in the $distro-master-keyring
  59     add_keys="$(get_fingerprints_of_keyring "$ADD_KEYRING")"
  60     all_add_keys=`aptkey_execute "$GPG_SH" --keyring "$ADD_KEYRING" --with-colons --list-keys | grep ^[ps]ub | cut -d: -f5`
  61     master_keys=`aptkey_execute "$GPG_SH" --keyring "$MASTER" --with-colons --list-keys | grep ^pub | cut -d: -f5`
  62
  63     # ensure there are no colisions LP: #857472
  64     for all_add_key in $all_add_keys; do
  65         for master_key in $master_keys; do
  66             if [ "$all_add_key" = "$master_key" ]; then
  67                 echo >&2 "Keyid collision for '$all_add_key' detected, operation aborted"
  68                 return 1
  69             fi
  70         done
  71     done
  72
  73     for add_key in $add_keys; do
  74         # export the add keyring one-by-one
  75         local TMP_KEYRING="${GPGHOMEDIR}/tmp-keyring.gpg"
  76         aptkey_execute "$GPG_SH" --batch --yes --keyring "$ADD_KEYRING" --output "$TMP_KEYRING" --export "$add_key"
  77         if ! aptkey_execute "$GPG_SH" --batch --yes --keyring "$TMP_KEYRING" --import "$MASTER" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
  78             cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
  79             false
  80         fi
  81         # check if signed with the master key and only add in this case
  82         ADDED=0
  83         for master_key in $master_keys; do
  84             if aptkey_execute "$GPG_SH" --keyring "$TMP_KEYRING" --check-sigs --with-colons "$add_key" \
  85                | grep '^sig:!:' | cut -d: -f5 | grep -q "$master_key"; then
  86                 aptkey_execute "$GPG_SH" --batch --yes --keyring "$ADD_KEYRING" --export "$add_key" \
  87                    | aptkey_execute "$GPG" --batch --yes --import
  88                 ADDED=1
  89             fi
  90         done
  91         if [ $ADDED = 0 ]; then
  92             echo >&2 "Key '$add_key' not added. It is not signed with a master key"
  93         fi
  94         rm -f "${TMP_KEYRING}"
  95     done
  96 }
  97
  98 # update the current archive signing keyring from a network URI
  99 # the archive-keyring keys needs to be signed with the master key
 100 # (otherwise it does not make sense from a security POV)
 101 net_update() {
 102     # Disabled for now as code is insecure (LP: #1013639 (and 857472, 1013128))
 103     APT_KEY_NET_UPDATE_ENABLED=""
 104     eval $(apt-config shell APT_KEY_NET_UPDATE_ENABLED APT::Key::Net-Update-Enabled)
 105     if [ -z "$APT_KEY_NET_UPDATE_ENABLED" ]; then
 106         exit 1
 107     fi
 108
 109     if [ -z "$ARCHIVE_KEYRING_URI" ]; then
 110         echo >&2 "ERROR: Your distribution is not supported in net-update as no uri for the archive-keyring is set"
 111         exit 1
 112     fi
 113     # in theory we would need to depend on wget for this, but this feature
 114     # isn't useable in debian anyway as we have no keyring uri nor a master key
 115     if ! command -v wget >/dev/null 2>&1; then
 116         echo >&2 "ERROR: an installed wget is required for a network-based update"
 117         exit 1
 118     fi
 119     if [ ! -d "${APT_DIR}/var/lib/apt/keyrings" ]; then
 120         mkdir -p "${APT_DIR}/var/lib/apt/keyrings"
 121     fi
 122     keyring="${APT_DIR}/var/lib/apt/keyrings/$(basename "$ARCHIVE_KEYRING_URI")"
 123     old_mtime=0
 124     if [ -e $keyring ]; then
 125         old_mtime=$(stat -c %Y $keyring)
 126     fi
 127     (cd  "${APT_DIR}/var/lib/apt/keyrings"; wget --timeout=90 -q -N "$ARCHIVE_KEYRING_URI")
 128     if [ ! -e "$keyring" ]; then
 129         return
 130     fi
 131     new_mtime=$(stat -c %Y "$keyring")
 132     if [ $new_mtime -ne $old_mtime ]; then
 133         aptkey_echo "Checking for new archive signing keys now"
 134         add_keys_with_verify_against_master_keyring "$keyring" "$MASTER_KEYRING"
 135     fi
 136 }
 137
 138 update() {
 139     if [ ! -f "$ARCHIVE_KEYRING" ]; then
 140         echo >&2 "ERROR: Can't find the archive-keyring"
 141         echo >&2 "Is the &keyring-package; package installed?"
 142         exit 1
 143     fi
 144
 145     # add new keys from the package;
 146
 147     # we do not use add_keys_with_verify_against_master_keyring here,
 148     # because "update" is run on regular package updates.  A
 149     # attacker might as well replace the master-archive-keyring file
 150     # in the package and add his own keys. so this check wouldn't
 151     # add any security. we *need* this check on net-update though
 152     import_keyring_into_keyring "$ARCHIVE_KEYRING" '' && cat "${GPGHOMEDIR}/gpgoutput.log"
 153
 154     if [ -r "$REMOVED_KEYS" ]; then
 155         # remove no-longer supported/used keys
 156         get_fingerprints_of_keyring "$REMOVED_KEYS" | while read key; do
 157             foreach_keyring_do 'remove_key_from_keyring' "$key"
 158         done
 159     else
 160         echo >&2 "Warning: removed keys keyring  $REMOVED_KEYS missing or not readable"
 161     fi
 162 }
 163
 164 remove_key_from_keyring() {
 165     local KEYRINGFILE="$1"
 166     shift
 167     # non-existent keyrings have by definition no keys
 168     if [ ! -e "$KEYRINGFILE" ]; then
 169        return
 170     fi
 171
 172     for KEY in "$@"; do
 173         local FINGERPRINTS="${GPGHOMEDIR}/keyringfile.keylst"
 174         get_fingerprints_of_keyring "$KEYRINGFILE" > "$FINGERPRINTS"
 175         # check if the key is in this keyring
 176         if ! grep -iq "^[0-9A-F]*${KEY}$" "$FINGERPRINTS"; then
 177             continue
 178         fi
 179         if [ ! -w "$KEYRINGFILE" ]; then
 180             echo >&2 "Key ${KEY} is in keyring ${KEYRINGFILE}, but can't be removed as it is read only."
 181             continue
 182         fi
 183         # check if it is the only key in the keyring and if so remove the keyring altogether
 184         if [ '1' = "$(uniq "$FINGERPRINTS" | wc -l)" ]; then
 185             mv -f "$KEYRINGFILE" "${KEYRINGFILE}~" # behave like gpg
 186             return
 187         fi
 188         # we can't just modify pointed to files as these might be in /usr or something
 189         local REALTARGET
 190         if [ -L "$KEYRINGFILE" ]; then
 191             REALTARGET="$(readlink -f "$KEYRINGFILE")"
 192             mv -f "$KEYRINGFILE" "${KEYRINGFILE}.dpkg-tmp"
 193             cp -a "$REALTARGET" "$KEYRINGFILE"
 194         fi
 195         # delete the key from the keyring
 196         aptkey_execute "$GPG_SH" --keyring "$KEYRINGFILE" --batch --delete-keys --yes "$KEY"
 197         if [ -n "$REALTARGET" ]; then
 198             # the real backup is the old link, not the copy we made
 199             mv -f "${KEYRINGFILE}.dpkg-tmp" "${KEYRINGFILE}~"
 200         fi
 201     done
 202 }
 203
 204 foreach_keyring_do() {
 205    local ACTION="$1"
 206    shift
 207    # if a --keyring was given, just work on this one
 208    if [ -n "$FORCED_KEYRING" ]; then
 209         $ACTION "$FORCED_KEYRING" "$@"
 210    else
 211         # otherwise all known keyrings are up for inspection
 212         if [ -s "$TRUSTEDFILE" ]; then
 213             $ACTION "$TRUSTEDFILE" "$@"
 214         fi
 215         local TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
 216         eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
 217         if [ -d "$TRUSTEDPARTS" ]; then
 218             # strip / suffix as gpg will double-slash in that case (#665411)
 219             local STRIPPED_TRUSTEDPARTS="${TRUSTEDPARTS%/}"
 220             if [ "${STRIPPED_TRUSTEDPARTS}/" = "$TRUSTEDPARTS" ]; then
 221                 TRUSTEDPARTS="$STRIPPED_TRUSTEDPARTS"
 222             fi
 223             for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do
 224                 if [ -s "$trusted" ]; then
 225                     $ACTION "$trusted" "$@"
 226                 fi
 227             done
 228         fi
 229    fi
 230 }
 231
 232 run_cmd_on_keyring() {
 233     local KEYRINGFILE="$1"
 234     shift
 235     # fingerprint and co will fail if key isn't in this keyring
 236     aptkey_execute "$GPG_SH" --keyring "$KEYRINGFILE" --batch "$@" 2>/dev/null || true
 237 }
 238
 239 import_keyring_into_keyring() {
 240     local FROM="${1:-${GPGHOMEDIR}/pubring.gpg}"
 241     local TO="${2:-${GPGHOMEDIR}/pubring.gpg}"
 242     shift 2
 243     rm -f "${GPGHOMEDIR}/gpgoutput.log"
 244     # the idea is simple: We take keys from one keyring and copy it to another
 245     # we do this with so many checks in between to ensure that WE control the
 246     # creation, so we know that the (potentially) created $TO keyring is a
 247     # simple keyring rather than a keybox as gpg2 would create it which in turn
 248     # can't be read by gpgv.
 249     # BEWARE: This is designed more in the way to work with the current
 250     # callers, than to have a well defined it would be easy to add new callers to.
 251     if [ ! -s "$TO" ]; then
 252         if [ -s "$FROM" ]; then
 253             if [ -z "$2" ]; then
 254                 if ! aptkey_execute "$GPG_SH" --keyring "$FROM" --export ${1:+"$1"} > "$TO" 2> "${GPGHOMEDIR}/gpgoutput.log"; then
 255                     cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 256                     false
 257                 else
 258                     chmod 0644 -- "$TO"
 259                 fi
 260             else
 261                 create_new_keyring "$TO"
 262             fi
 263         else
 264             create_new_keyring "$TO"
 265         fi
 266     elif [ -s "$FROM" ]; then
 267         local EXPORTLIMIT="$1"
 268         if [ -n "$1$2" ]; then shift; fi
 269         if ! aptkey_execute "$GPG_SH" --keyring "$FROM" --export ${EXPORTLIMIT:+"$EXPORTLIMIT"} \
 270            | aptkey_execute "$GPG_SH" --keyring "$TO" --batch --import "$@" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
 271             cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 272             false
 273         fi
 274     fi
 275 }
 276
 277 merge_all_trusted_keyrings_into_pubring() {
 278     # does the same as:
 279     # foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg"
 280     # but without using gpg, just cat and find
 281     local PUBRING="${GPGHOMEDIR}/pubring.gpg"
 282     # if a --keyring was given, just use this one
 283     if [ -n "$FORCED_KEYRING" ]; then
 284         if [ -s "$FORCED_KEYRING" ]; then
 285             cp --dereference "$FORCED_KEYRING" "$PUBRING"
 286         fi
 287     else
 288         # otherwise all known keyrings are merged
 289         local TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
 290         eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
 291         if [ -d "$TRUSTEDPARTS" ]; then
 292             # ignore errors mostly for non-existing $TRUSTEDFILE
 293             {
 294                cat "$TRUSTEDFILE" || true
 295                for parts in $(find -L "$TRUSTEDPARTS" -type f -name '*.gpg'); do
 296                   cat "$parts" || true
 297                done
 298             } > "$PUBRING" 2>/dev/null
 299         elif [ -s "$TRUSTEDFILE" ]; then
 300             cp --dereference "$TRUSTEDFILE" "$PUBRING"
 301         fi
 302     fi
 303
 304     if [ ! -s "$PUBRING" ]; then
 305         touch "$PUBRING"
 306     fi
 307 }
 308
 309 import_keys_from_keyring() {
 310     import_keyring_into_keyring "$1" "$2"
 311 }
 312
 313 merge_keys_into_keyrings() {
 314     import_keyring_into_keyring "$2" "$1" '' --import-options 'merge-only'
 315 }
 316
 317 merge_back_changes() {
 318     if [ -n "$FORCED_KEYRING" ]; then
 319         # if the keyring was forced merge is already done
 320         return
 321     fi
 322     if [ -s "${GPGHOMEDIR}/pubring.gpg" ]; then
 323         # merge all updated keys
 324         foreach_keyring_do 'merge_keys_into_keyrings' "${GPGHOMEDIR}/pubring.gpg"
 325     fi
 326     # look for keys which were added or removed
 327     get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.orig.gpg" > "${GPGHOMEDIR}/pubring.orig.keylst"
 328     get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.gpg" > "${GPGHOMEDIR}/pubring.keylst"
 329     comm -3 "${GPGHOMEDIR}/pubring.keylst" "${GPGHOMEDIR}/pubring.orig.keylst" > "${GPGHOMEDIR}/pubring.diff"
 330     # key isn't part of new keyring, so remove
 331     cut -f 2 "${GPGHOMEDIR}/pubring.diff" | while read key; do
 332         if [ -z "$key" ]; then continue; fi
 333         foreach_keyring_do 'remove_key_from_keyring' "$key"
 334     done
 335     # key is only part of new keyring, so we need to import it
 336     cut -f 1 "${GPGHOMEDIR}/pubring.diff" | while read key; do
 337         if [ -z "$key" ]; then continue; fi
 338         import_keyring_into_keyring '' "$TRUSTEDFILE" "$key"
 339     done
 340 }
 341
 342 setup_merged_keyring() {
 343     if [ -n "$FORCED_KEYID" ]; then
 344         merge_all_trusted_keyrings_into_pubring
 345         FORCED_KEYRING="${GPGHOMEDIR}/forcedkeyid.gpg"
 346         TRUSTEDFILE="${FORCED_KEYRING}"
 347         echo "#!/bin/sh
 348 exec sh \"${GPG}\" --keyring \"${TRUSTEDFILE}\" \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 349         GPG="${GPGHOMEDIR}/gpg.1.sh"
 350         # ignore error as this "just" means we haven't found the forced keyid and the keyring will be empty
 351         import_keyring_into_keyring '' "$TRUSTEDFILE" "$FORCED_KEYID" || true
 352     elif [ -z "$FORCED_KEYRING" ]; then
 353         merge_all_trusted_keyrings_into_pubring
 354         if [ -r "${GPGHOMEDIR}/pubring.gpg" ]; then
 355             cp -a "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
 356         else
 357            touch "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
 358         fi
 359         echo "#!/bin/sh
 360 exec sh \"${GPG}\" --keyring \"${GPGHOMEDIR}/pubring.gpg\" \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 361         GPG="${GPGHOMEDIR}/gpg.1.sh"
 362     else
 363         create_new_keyring "$TRUSTEDFILE"
 364         echo "#!/bin/sh
 365 exec sh \"${GPG}\" --keyring \"${TRUSTEDFILE}\" \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 366         GPG="${GPGHOMEDIR}/gpg.1.sh"
 367     fi
 368 }
 369
 370 create_new_keyring() {
 371     # gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead.
 372     if ! [ -e "$TRUSTEDFILE" ]; then
 373         if [ -w "$(dirname "$TRUSTEDFILE")" ]; then
 374             touch -- "$TRUSTEDFILE"
 375             chmod 0644 -- "$TRUSTEDFILE"
 376         fi
 377     fi
 378 }
 379
 380 aptkey_execute() { sh "$@"; }
 381
 382 usage() {
 383     echo "Usage: apt-key [--keyring file] [command] [arguments]"
 384     echo
 385     echo "Manage apt's list of trusted keys"
 386     echo
 387     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
 388     echo "  apt-key del <keyid>         - remove the key <keyid>"
 389     echo "  apt-key export <keyid>      - output the key <keyid>"
 390     echo "  apt-key exportall           - output all trusted keys"
 391     echo "  apt-key update              - update keys using the keyring package"
 392     echo "  apt-key net-update          - update keys using the network"
 393     echo "  apt-key list                - list keys"
 394     echo "  apt-key finger              - list fingerprints"
 395     echo "  apt-key adv                 - pass advanced options to gpg (download key)"
 396     echo
 397     echo "If no specific keyring file is given the command applies to all keyring files."
 398 }
 399
 400 while [ -n "$1" ]; do
 401    case "$1" in
 402       --keyring)
 403          shift
 404          TRUSTEDFILE="$1"
 405          FORCED_KEYRING="$1"
 406          ;;
 407       --keyid)
 408          shift
 409          FORCED_KEYID="$1"
 410          ;;
 411       --secret-keyring)
 412          shift
 413          FORCED_SECRET_KEYRING="$1"
 414          ;;
 415       --readonly)
 416          merge_back_changes() { true; }
 417          create_new_keyring() { if [ ! -r "$FORCED_KEYRING" ]; then TRUSTEDFILE='/dev/null'; FORCED_KEYRING="$TRUSTEDFILE"; fi; }
 418          ;;
 419       --fakeroot)
 420          requires_root() { true; }
 421          ;;
 422       --quiet)
 423          aptkey_echo() { true; }
 424          ;;
 425       --debug1)
 426          # some cmds like finger redirect stderr to /dev/null …
 427         aptkey_execute() { echo 'EXEC:' "$@"; sh "$@"; }
 428         ;;
 429       --debug2)
 430          # … other more complicated ones pipe gpg into gpg.
 431         aptkey_execute() { echo >&2 'EXEC:' "$@"; sh "$@"; }
 432         ;;
 433       --*)
 434          echo >&2 "Unknown option: $1"
 435          usage
 436          exit 1;;
 437       *)
 438          break;;
 439    esac
 440    shift
 441 done
 442
 443 if [ -z "$TRUSTEDFILE" ]; then
 444    TRUSTEDFILE="/etc/apt/trusted.gpg"
 445    eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
 446    eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
 447 fi
 448
 449 command="$1"
 450 if [ -z "$command" ]; then
 451     usage
 452     exit 1
 453 fi
 454 shift
 455
 456 create_gpg_home() {
 457     # gpg needs (in different versions more or less) files to function correctly,
 458     # so we give it its own homedir and generate some valid content for it later on
 459     if [ -n "$TMPDIR" ]; then
 460         # tmpdir is a directory and current user has rwx access to it
 461         # same tests as in apt-pkg/contrib/fileutl.cc GetTempDir()
 462         if [ ! -d "$TMPDIR" ] || [ ! -r "$TMPDIR" ] || [ ! -w "$TMPDIR" ] || [ ! -x "$TMPDIR" ]; then
 463             unset TMPDIR
 464         fi
 465     fi
 466     GPGHOMEDIR="$(mktemp -d)"
 467     CURRENTTRAP="${CURRENTTRAP} rm -rf '${GPGHOMEDIR}';"
 468     trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
 469     chmod 700 "$GPGHOMEDIR"
 470 }
 471
 472 prepare_gpg_home() {
 473     eval $(apt-config shell GPG_EXE Apt::Key::gpgcommand)
 474
 475     if [ -n "$GPG_EXE" ] && command -v "$GPG_EXE" >/dev/null 2>&1; then
 476         true
 477     elif command -v gpg >/dev/null 2>&1; then
 478         GPG_EXE="gpg"
 479     elif command -v gpg2 >/dev/null 2>&1; then
 480         GPG_EXE="gpg2"
 481     else
 482         echo >&2 "Error: gnupg or gnupg2 do not seem to be installed,"
 483         echo >&2 "Error: but apt-key requires gnupg or gnupg2 for this operation."
 484         echo >&2
 485         exit 255
 486     fi
 487
 488     create_gpg_home
 489
 490     # We don't use a secret keyring, of course, but gpg panics and
 491     # implodes if there isn't one available - and writeable for imports
 492     SECRETKEYRING="${GPGHOMEDIR}/secring.gpg"
 493     touch "$SECRETKEYRING"
 494
 495     # create the trustdb with an (empty) dummy keyring
 496     # older gpgs required it, newer gpgs even warn that it isn't needed,
 497     # but require it nonetheless for some commands, so we just play safe
 498     # here for the foreseeable future and create a dummy one
 499     if ! "$GPG_EXE" --ignore-time-conflict --no-options --no-default-keyring \
 500        --homedir "$GPGHOMEDIR" --quiet --check-trustdb --keyring "$SECRETKEYRING" >"${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
 501        cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 502        false
 503     fi
 504     # tell gpg that it shouldn't try to maintain a trustdb file
 505     echo "#!/bin/sh
 506 exec \"${GPG_EXE}\" --ignore-time-conflict --no-options --no-default-keyring \\
 507    --homedir \"${GPGHOMEDIR}\" --no-auto-check-trustdb --trust-model always \"\$@\"" > "${GPGHOMEDIR}/gpg.0.sh"
 508     GPG_SH="${GPGHOMEDIR}/gpg.0.sh"
 509     GPG="$GPG_SH"
 510
 511     # for advanced operations, we might really need a secret keyring after all
 512     if [ -n "$FORCED_SECRET_KEYRING" ] && [ -r "$FORCED_SECRET_KEYRING" ]; then
 513         rm -f "$SECRETKEYRING"
 514         cp -a "$FORCED_SECRET_KEYRING" "$SECRETKEYRING"
 515     fi
 516
 517     # older gpg versions need a secring file, but newer versions take it as
 518     # a hint to start a migration from earlier versions. The file is empty
 519     # anyhow, so nothing actually happens, but its three lines of output
 520     # nobody expects to see in apt-key context, so trigger it in silence
 521     echo -n | aptkey_execute "$GPG" --batch --import >/dev/null 2>&1 || true
 522 }
 523
 524 if [ "$command" != 'help' ] && [ "$command" != 'verify' ]; then
 525     prepare_gpg_home
 526 fi
 527
 528 case "$command" in
 529     add)
 530         requires_root
 531         setup_merged_keyring
 532         aptkey_execute "$GPG" --quiet --batch --import "$@"
 533         merge_back_changes
 534         aptkey_echo "OK"
 535         ;;
 536     del|rm|remove)
 537         requires_root
 538         foreach_keyring_do 'remove_key_from_keyring' "$@"
 539         aptkey_echo "OK"
 540         ;;
 541     update)
 542         requires_root
 543         setup_merged_keyring
 544         update
 545         merge_back_changes
 546         ;;
 547     net-update)
 548         requires_root
 549         setup_merged_keyring
 550         net_update
 551         merge_back_changes
 552         ;;
 553     list)
 554         foreach_keyring_do 'run_cmd_on_keyring' --list-keys "$@"
 555         ;;
 556     finger*)
 557         foreach_keyring_do 'run_cmd_on_keyring' --fingerprint "$@"
 558         ;;
 559     export|exportall)
 560         merge_all_trusted_keyrings_into_pubring
 561         aptkey_execute "$GPG_SH" --keyring "${GPGHOMEDIR}/pubring.gpg" --armor --export "$@"
 562         ;;
 563     adv*)
 564         setup_merged_keyring
 565         aptkey_echo "Executing: $GPG $*"
 566         aptkey_execute "$GPG" "$@"
 567         merge_back_changes
 568         ;;
 569     verify)
 570         GPGV=''
 571         eval $(apt-config shell GPGV Apt::Key::gpgvcommand)
 572         if [ -n "$GPGV" ] && command -v "$GPGV" >/dev/null 2>&1; then true;
 573         elif command -v gpgv >/dev/null 2>&1; then GPGV='gpgv';
 574         elif command -v gpgv2 >/dev/null 2>&1; then GPGV='gpgv2';
 575         else
 576            echo >&2 'ERROR: gpgv or gpgv2 required for verification'
 577            exit 29
 578         fi
 579         # for a forced keyid we need gpg --export, so full wrapping required
 580         if [ -n "$FORCED_KEYID" ]; then
 581             prepare_gpg_home
 582         else
 583             create_gpg_home
 584         fi
 585         setup_merged_keyring
 586         if [ -n "$FORCED_KEYRING" ]; then
 587             "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "${FORCED_KEYRING}" --ignore-time-conflict "$@"
 588         else
 589             "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "${GPGHOMEDIR}/pubring.gpg" --ignore-time-conflict "$@"
 590         fi
 591         ;;
 592     help)
 593         usage
 594         ;;
 595     *)
 596         usage
 597         exit 1
 598         ;;
 599 esac