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         # check if the key is in this keyring
 195         if ! grep -iq "^[0-9A-F]*${KEY}$" "$FINGERPRINTS"; then
 196             continue
 197         fi
 198         if [ ! -w "$KEYRINGFILE" ]; then
 199             echo >&2 "Key ${KEY} is in keyring ${KEYRINGFILE}, but can't be removed as it is read only."
 200             continue
 201         fi
 202         # check if it is the only key in the keyring and if so remove the keyring altogether
 203         if [ '1' = "$(uniq "$FINGERPRINTS" | wc -l)" ]; then
 204             mv -f "$KEYRINGFILE" "${KEYRINGFILE}~" # behave like gpg
 205             return
 206         fi
 207         # we can't just modify pointed to files as these might be in /usr or something
 208         local REALTARGET
 209         if [ -L "$KEYRINGFILE" ]; then
 210             REALTARGET="$(readlink -f "$KEYRINGFILE")"
 211             mv -f "$KEYRINGFILE" "${KEYRINGFILE}.dpkg-tmp"
 212             cp -a "$REALTARGET" "$KEYRINGFILE"
 213         fi
 214         # delete the key from the keyring
 215         aptkey_execute "$GPG_SH" --keyring "$KEYRINGFILE" --batch --delete-keys --yes "$KEY"
 216         if [ -n "$REALTARGET" ]; then
 217             # the real backup is the old link, not the copy we made
 218             mv -f "${KEYRINGFILE}.dpkg-tmp" "${KEYRINGFILE}~"
 219         fi
 220     done
 221 }
 222
 223 foreach_keyring_do() {
 224    local ACTION="$1"
 225    shift
 226    # if a --keyring was given, just work on this one
 227    if [ -n "$FORCED_KEYRING" ]; then
 228         $ACTION "$FORCED_KEYRING" "$@"
 229    else
 230         # otherwise all known keyrings are up for inspection
 231         if [ -s "$TRUSTEDFILE" ]; then
 232             $ACTION "$TRUSTEDFILE" "$@"
 233         fi
 234         local TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
 235         eval "$(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)"
 236         if [ -d "$TRUSTEDPARTS" ]; then
 237             # strip / suffix as gpg will double-slash in that case (#665411)
 238             local STRIPPED_TRUSTEDPARTS="${TRUSTEDPARTS%/}"
 239             if [ "${STRIPPED_TRUSTEDPARTS}/" = "$TRUSTEDPARTS" ]; then
 240                 TRUSTEDPARTS="$STRIPPED_TRUSTEDPARTS"
 241             fi
 242             for trusted in $(find "$TRUSTEDPARTS" -mindepth 1 -maxdepth 1 -regex '^.*\.gpg$' | sort); do
 243                 if [ -s "$trusted" ]; then
 244                     $ACTION "$trusted" "$@"
 245                 fi
 246             done
 247         fi
 248    fi
 249 }
 250
 251 run_cmd_on_keyring() {
 252     local KEYRINGFILE="$1"
 253     shift
 254     # fingerprint and co will fail if key isn't in this keyring
 255     aptkey_execute "$GPG_SH" --keyring "$KEYRINGFILE" --batch "$@" 2>/dev/null || true
 256 }
 257
 258 import_keyring_into_keyring() {
 259     local FROM="${1:-${GPGHOMEDIR}/pubring.gpg}"
 260     local TO="${2:-${GPGHOMEDIR}/pubring.gpg}"
 261     shift 2
 262     rm -f "${GPGHOMEDIR}/gpgoutput.log"
 263     # the idea is simple: We take keys from one keyring and copy it to another
 264     # we do this with so many checks in between to ensure that WE control the
 265     # creation, so we know that the (potentially) created $TO keyring is a
 266     # simple keyring rather than a keybox as gpg2 would create it which in turn
 267     # can't be read by gpgv.
 268     # BEWARE: This is designed more in the way to work with the current
 269     # callers, than to have a well defined it would be easy to add new callers to.
 270     if [ ! -s "$TO" ]; then
 271         if [ -s "$FROM" ]; then
 272             if [ -z "$2" ]; then
 273                 if ! aptkey_execute "$GPG_SH" --keyring "$FROM" --export ${1:+"$1"} > "$TO" 2> "${GPGHOMEDIR}/gpgoutput.log"; then
 274                     cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 275                     false
 276                 else
 277                     chmod 0644 -- "$TO"
 278                 fi
 279             else
 280                 create_new_keyring "$TO"
 281             fi
 282         else
 283             create_new_keyring "$TO"
 284         fi
 285     elif [ -s "$FROM" ]; then
 286         local EXPORTLIMIT="$1"
 287         if [ -n "$1$2" ]; then shift; fi
 288         if ! aptkey_execute "$GPG_SH" --keyring "$FROM" --export ${EXPORTLIMIT:+"$EXPORTLIMIT"} \
 289            | aptkey_execute "$GPG_SH" --keyring "$TO" --batch --import "$@" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
 290             cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 291             false
 292         fi
 293     fi
 294 }
 295
 296 merge_all_trusted_keyrings_into_pubring() {
 297     # does the same as:
 298     # foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg"
 299     # but without using gpg, just cat and find
 300     local PUBRING="${GPGHOMEDIR}/pubring.gpg"
 301     # if a --keyring was given, just use this one
 302     if [ -n "$FORCED_KEYRING" ]; then
 303         if [ -s "$FORCED_KEYRING" ]; then
 304             cp --dereference "$FORCED_KEYRING" "$PUBRING"
 305         fi
 306     else
 307         # otherwise all known keyrings are merged
 308         local TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
 309         eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
 310         if [ -d "$TRUSTEDPARTS" ]; then
 311             # ignore errors mostly for non-existing $TRUSTEDFILE
 312             {
 313                cat "$TRUSTEDFILE" || true
 314                for parts in $(find -L "$TRUSTEDPARTS" -type f -name '*.gpg'); do
 315                   cat "$parts" || true
 316                done
 317             } > "$PUBRING" 2>/dev/null
 318         elif [ -s "$TRUSTEDFILE" ]; then
 319             cp --dereference "$TRUSTEDFILE" "$PUBRING"
 320         fi
 321     fi
 322
 323     if [ ! -s "$PUBRING" ]; then
 324         touch "$PUBRING"
 325     fi
 326 }
 327
 328 import_keys_from_keyring() {
 329     import_keyring_into_keyring "$1" "$2"
 330 }
 331
 332 merge_keys_into_keyrings() {
 333     import_keyring_into_keyring "$2" "$1" '' --import-options 'merge-only'
 334 }
 335
 336 merge_back_changes() {
 337     if [ -n "$FORCED_KEYRING" ]; then
 338         # if the keyring was forced merge is already done
 339         return
 340     fi
 341     if [ -s "${GPGHOMEDIR}/pubring.gpg" ]; then
 342         # merge all updated keys
 343         foreach_keyring_do 'merge_keys_into_keyrings' "${GPGHOMEDIR}/pubring.gpg"
 344     fi
 345     # look for keys which were added or removed
 346     get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.orig.gpg" > "${GPGHOMEDIR}/pubring.orig.keylst"
 347     get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.gpg" > "${GPGHOMEDIR}/pubring.keylst"
 348     comm -3 "${GPGHOMEDIR}/pubring.keylst" "${GPGHOMEDIR}/pubring.orig.keylst" > "${GPGHOMEDIR}/pubring.diff"
 349     # key isn't part of new keyring, so remove
 350     cut -f 2 "${GPGHOMEDIR}/pubring.diff" | while read key; do
 351         if [ -z "$key" ]; then continue; fi
 352         foreach_keyring_do 'remove_key_from_keyring' "$key"
 353     done
 354     # key is only part of new keyring, so we need to import it
 355     cut -f 1 "${GPGHOMEDIR}/pubring.diff" | while read key; do
 356         if [ -z "$key" ]; then continue; fi
 357         import_keyring_into_keyring '' "$TRUSTEDFILE" "$key"
 358     done
 359 }
 360
 361 setup_merged_keyring() {
 362     if [ -n "$FORCED_KEYID" ]; then
 363         merge_all_trusted_keyrings_into_pubring
 364         FORCED_KEYRING="${GPGHOMEDIR}/forcedkeyid.gpg"
 365         TRUSTEDFILE="${FORCED_KEYRING}"
 366         echo "#!/bin/sh
 367 exec sh '($(escape_shell "${GPG}")' --keyring '$(escape_shell "${TRUSTEDFILE}")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 368         GPG="${GPGHOMEDIR}/gpg.1.sh"
 369         # ignore error as this "just" means we haven't found the forced keyid and the keyring will be empty
 370         import_keyring_into_keyring '' "$TRUSTEDFILE" "$FORCED_KEYID" || true
 371     elif [ -z "$FORCED_KEYRING" ]; then
 372         merge_all_trusted_keyrings_into_pubring
 373         if [ -r "${GPGHOMEDIR}/pubring.gpg" ]; then
 374             cp -a "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
 375         else
 376            touch "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
 377         fi
 378         echo "#!/bin/sh
 379 exec sh '$(escape_shell "${GPG}")' --keyring '$(escape_shell "${GPGHOMEDIR}/pubring.gpg")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 380         GPG="${GPGHOMEDIR}/gpg.1.sh"
 381     else
 382         create_new_keyring "$TRUSTEDFILE"
 383         echo "#!/bin/sh
 384 exec sh '$(escape_shell "${GPG}")' --keyring '$(escape_shell "${TRUSTEDFILE}")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh"
 385         GPG="${GPGHOMEDIR}/gpg.1.sh"
 386     fi
 387 }
 388
 389 create_new_keyring() {
 390     # gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead.
 391     if ! [ -e "$TRUSTEDFILE" ]; then
 392         if [ -w "$(dirname "$TRUSTEDFILE")" ]; then
 393             touch -- "$TRUSTEDFILE"
 394             chmod 0644 -- "$TRUSTEDFILE"
 395         fi
 396     fi
 397 }
 398
 399 aptkey_execute() { sh "$@"; }
 400
 401 usage() {
 402     echo "Usage: apt-key [--keyring file] [command] [arguments]"
 403     echo
 404     echo "Manage apt's list of trusted keys"
 405     echo
 406     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
 407     echo "  apt-key del <keyid>         - remove the key <keyid>"
 408     echo "  apt-key export <keyid>      - output the key <keyid>"
 409     echo "  apt-key exportall           - output all trusted keys"
 410     echo "  apt-key update              - update keys using the keyring package"
 411     echo "  apt-key net-update          - update keys using the network"
 412     echo "  apt-key list                - list keys"
 413     echo "  apt-key finger              - list fingerprints"
 414     echo "  apt-key adv                 - pass advanced options to gpg (download key)"
 415     echo
 416     echo "If no specific keyring file is given the command applies to all keyring files."
 417 }
 418
 419 while [ -n "$1" ]; do
 420    case "$1" in
 421       --keyring)
 422          shift
 423          TRUSTEDFILE="$1"
 424          FORCED_KEYRING="$1"
 425          ;;
 426       --keyid)
 427          shift
 428          FORCED_KEYID="$1"
 429          ;;
 430       --secret-keyring)
 431          shift
 432          FORCED_SECRET_KEYRING="$1"
 433          ;;
 434       --readonly)
 435          merge_back_changes() { true; }
 436          create_new_keyring() { if [ ! -r "$FORCED_KEYRING" ]; then TRUSTEDFILE='/dev/null'; FORCED_KEYRING="$TRUSTEDFILE"; fi; }
 437          ;;
 438       --fakeroot)
 439          requires_root() { true; }
 440          ;;
 441       --quiet)
 442          aptkey_echo() { true; }
 443          ;;
 444       --debug1)
 445          # some cmds like finger redirect stderr to /dev/null …
 446         aptkey_execute() { echo 'EXEC:' "$@"; sh "$@"; }
 447         ;;
 448       --debug2)
 449          # … other more complicated ones pipe gpg into gpg.
 450         aptkey_execute() { echo >&2 'EXEC:' "$@"; sh "$@"; }
 451         ;;
 452       --*)
 453          echo >&2 "Unknown option: $1"
 454          usage
 455          exit 1;;
 456       *)
 457          break;;
 458    esac
 459    shift
 460 done
 461
 462 if [ -z "$TRUSTEDFILE" ]; then
 463    TRUSTEDFILE="/etc/apt/trusted.gpg"
 464    eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
 465    eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
 466 fi
 467
 468 command="$1"
 469 if [ -z "$command" ]; then
 470     usage
 471     exit 1
 472 fi
 473 shift
 474
 475 create_gpg_home() {
 476     # gpg needs (in different versions more or less) files to function correctly,
 477     # so we give it its own homedir and generate some valid content for it later on
 478     if [ -n "$TMPDIR" ]; then
 479         # tmpdir is a directory and current user has rwx access to it
 480         # same tests as in apt-pkg/contrib/fileutl.cc GetTempDir()
 481         if [ ! -d "$TMPDIR" ] || [ ! -r "$TMPDIR" ] || [ ! -w "$TMPDIR" ] || [ ! -x "$TMPDIR" ]; then
 482             unset TMPDIR
 483         fi
 484     fi
 485     GPGHOMEDIR="$(mktemp -d)"
 486     CURRENTTRAP="${CURRENTTRAP} rm -rf '$(escape_shell "${GPGHOMEDIR}")';"
 487     trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
 488     chmod 700 "$GPGHOMEDIR"
 489 }
 490
 491 prepare_gpg_home() {
 492     eval "$(apt-config shell GPG_EXE Apt::Key::gpgcommand)"
 493
 494     if [ -n "$GPG_EXE" ] && command_available "$GPG_EXE"; then
 495         true
 496     elif command_available 'gpg'; then
 497         GPG_EXE="gpg"
 498     elif command_available 'gpg2'; then
 499         GPG_EXE="gpg2"
 500     else
 501         echo >&2 "Error: gnupg or gnupg2 do not seem to be installed,"
 502         echo >&2 "Error: but apt-key requires gnupg or gnupg2 for this operation."
 503         echo >&2
 504         exit 255
 505     fi
 506
 507     create_gpg_home
 508
 509     # We don't use a secret keyring, of course, but gpg panics and
 510     # implodes if there isn't one available - and writeable for imports
 511     SECRETKEYRING="${GPGHOMEDIR}/secring.gpg"
 512     touch "$SECRETKEYRING"
 513
 514     # create the trustdb with an (empty) dummy keyring
 515     # older gpgs required it, newer gpgs even warn that it isn't needed,
 516     # but require it nonetheless for some commands, so we just play safe
 517     # here for the foreseeable future and create a dummy one
 518     if ! "$GPG_EXE" --ignore-time-conflict --no-options --no-default-keyring \
 519        --homedir "$GPGHOMEDIR" --quiet --check-trustdb --keyring "$SECRETKEYRING" >"${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
 520        cat >&2 "${GPGHOMEDIR}/gpgoutput.log"
 521        false
 522     fi
 523     # tell gpg that it shouldn't try to maintain a trustdb file
 524     echo "#!/bin/sh
 525 exec '$(escape_shell "${GPG_EXE}")' --ignore-time-conflict --no-options --no-default-keyring \\
 526 --homedir '$(escape_shell "${GPGHOMEDIR}")' --no-auto-check-trustdb --trust-model always \"\$@\"" > "${GPGHOMEDIR}/gpg.0.sh"
 527     GPG_SH="${GPGHOMEDIR}/gpg.0.sh"
 528     GPG="$GPG_SH"
 529
 530     # for advanced operations, we might really need a secret keyring after all
 531     if [ -n "$FORCED_SECRET_KEYRING" ] && [ -r "$FORCED_SECRET_KEYRING" ]; then
 532         rm -f "$SECRETKEYRING"
 533         cp -a "$FORCED_SECRET_KEYRING" "$SECRETKEYRING"
 534     fi
 535
 536     # older gpg versions need a secring file, but newer versions take it as
 537     # a hint to start a migration from earlier versions. The file is empty
 538     # anyhow, so nothing actually happens, but its three lines of output
 539     # nobody expects to see in apt-key context, so trigger it in silence
 540     echo -n | aptkey_execute "$GPG" --batch --import >/dev/null 2>&1 || true
 541 }
 542
 543 if [ "$command" != 'help' ] && [ "$command" != 'verify' ]; then
 544     prepare_gpg_home
 545 fi
 546
 547 case "$command" in
 548     add)
 549         requires_root
 550         setup_merged_keyring
 551         aptkey_execute "$GPG" --quiet --batch --import "$@"
 552         merge_back_changes
 553         aptkey_echo "OK"
 554         ;;
 555     del|rm|remove)
 556         requires_root
 557         foreach_keyring_do 'remove_key_from_keyring' "$@"
 558         aptkey_echo "OK"
 559         ;;
 560     update)
 561         requires_root
 562         setup_merged_keyring
 563         update
 564         merge_back_changes
 565         ;;
 566     net-update)
 567         requires_root
 568         setup_merged_keyring
 569         net_update
 570         merge_back_changes
 571         ;;
 572     list)
 573         foreach_keyring_do 'run_cmd_on_keyring' --list-keys "$@"
 574         ;;
 575     finger*)
 576         foreach_keyring_do 'run_cmd_on_keyring' --fingerprint "$@"
 577         ;;
 578     export|exportall)
 579         merge_all_trusted_keyrings_into_pubring
 580         aptkey_execute "$GPG_SH" --keyring "${GPGHOMEDIR}/pubring.gpg" --armor --export "$@"
 581         ;;
 582     adv*)
 583         setup_merged_keyring
 584         aptkey_echo "Executing: $GPG $*"
 585         aptkey_execute "$GPG" "$@"
 586         merge_back_changes
 587         ;;
 588     verify)
 589         GPGV=''
 590         eval $(apt-config shell GPGV Apt::Key::gpgvcommand)
 591         if [ -n "$GPGV" ] && command_available "$GPGV"; then true;
 592         elif command_available 'gpgv'; then GPGV='gpgv';
 593         elif command_available 'gpgv2'; then GPGV='gpgv2';
 594         else
 595            echo >&2 'ERROR: gpgv or gpgv2 required for verification'
 596            exit 29
 597         fi
 598         # for a forced keyid we need gpg --export, so full wrapping required
 599         if [ -n "$FORCED_KEYID" ]; then
 600             prepare_gpg_home
 601         else
 602             create_gpg_home
 603         fi
 604         setup_merged_keyring
 605         if [ -n "$FORCED_KEYRING" ]; then
 606             "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "${FORCED_KEYRING}" --ignore-time-conflict "$@"
 607         else
 608             "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "${GPGHOMEDIR}/pubring.gpg" --ignore-time-conflict "$@"
 609         fi
 610         ;;
 611     help)
 612         usage
 613         ;;
 614     *)
 615         usage
 616         exit 1
 617         ;;
 618 esac