diff options
Diffstat (limited to 'cmdline/apt-key.in')
| -rw-r--r-- | cmdline/apt-key.in | 839 |
1 files changed, 839 insertions, 0 deletions
diff --git a/cmdline/apt-key.in b/cmdline/apt-key.in new file mode 100644 index 0000000..baf3df5 --- /dev/null +++ b/cmdline/apt-key.in @@ -0,0 +1,839 @@ +#!/bin/sh + +set -e +unset GREP_OPTIONS GPGHOMEDIR CURRENTTRAP +export IFS="$(printf "\n\b")" + +MASTER_KEYRING='&keyring-master-filename;' +eval "$(apt-config shell MASTER_KEYRING APT::Key::MasterKeyring)" +ARCHIVE_KEYRING='&keyring-filename;' +eval "$(apt-config shell ARCHIVE_KEYRING APT::Key::ArchiveKeyring)" +REMOVED_KEYS='&keyring-removed-filename;' +eval "$(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys)" +ARCHIVE_KEYRING_URI='&keyring-uri;' +eval "$(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI)" + +aptkey_echo() { echo "$@"; } + +find_gpgv_status_fd() { + while [ -n "$1" ]; do + if [ "$1" = '--status-fd' ]; then + shift + echo "$1" + break + fi + shift + done +} +GPGSTATUSFD="$(find_gpgv_status_fd "$@")" + +apt_warn() { + if [ -z "$GPGHOMEDIR" ]; then + echo >&2 'W:' "$@" + else + echo 'W:' "$@" > "${GPGHOMEDIR}/aptwarnings.log" + fi + if [ -n "$GPGSTATUSFD" ]; then + echo >&${GPGSTATUSFD} '[APTKEY:] WARNING' "$@" + fi +} +apt_error() { + if [ -z "$GPGHOMEDIR" ]; then + echo >&2 'E:' "$@" + else + echo 'E:' "$@" > "${GPGHOMEDIR}/aptwarnings.log" + fi + if [ -n "$GPGSTATUSFD" ]; then + echo >&${GPGSTATUSFD} '[APTKEY:] ERROR' "$@" + fi +} + +cleanup_gpg_home() { + if [ -z "$GPGHOMEDIR" ]; then return; fi + if [ -s "$GPGHOMEDIR/aptwarnings.log" ]; then + cat >&2 "$GPGHOMEDIR/aptwarnings.log" + fi + if command_available 'gpgconf'; then + GNUPGHOME="${GPGHOMEDIR}" gpgconf --kill all >/dev/null 2>&1 || true + fi + rm -rf "$GPGHOMEDIR" +} + +# gpg needs (in different versions more or less) files to function correctly, +# so we give it its own homedir and generate some valid content for it later on +create_gpg_home() { + # for cases in which we want to cache a homedir due to expensive setup + if [ -n "$GPGHOMEDIR" ]; then + return + fi + if [ -n "$TMPDIR" ]; then + # tmpdir is a directory and current user has rwx access to it + # same tests as in apt-pkg/contrib/fileutl.cc GetTempDir() + if [ ! -d "$TMPDIR" ] || [ ! -r "$TMPDIR" ] || [ ! -w "$TMPDIR" ] || [ ! -x "$TMPDIR" ]; then + unset TMPDIR + fi + fi + GPGHOMEDIR="$(mktemp --directory --tmpdir 'apt-key-gpghome.XXXXXXXXXX')" + CURRENTTRAP="${CURRENTTRAP} cleanup_gpg_home;" + trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM + if [ -z "$GPGHOMEDIR" ]; then + apt_error "Could not create temporary gpg home directory in $TMPDIR (wrong permissions?)" + exit 28 + fi + chmod 700 "$GPGHOMEDIR" +} + +requires_root() { + if [ "$(id -u)" -ne 0 ]; then + apt_error "This command can only be used by root." + exit 1 + fi +} + +command_available() { + if [ -x "$1" ]; then return 0; fi + # command -v "$1" >/dev/null 2>&1 # not required by policy, see #747320 + # which "$1" >/dev/null 2>&1 # is in debianutils (essential) but not on non-debian systems + local OLDIFS="$IFS" + IFS=: + for p in $PATH; do + if [ -x "${p}/${1}" ]; then + IFS="$OLDIFS" + return 0 + fi + done + IFS="$OLDIFS" + return 1 +} + +escape_shell() { + echo "$@" | sed -e "s#'#'\"'\"'#g" +} + +get_fingerprints_of_keyring() { + aptkey_execute "$GPG_SH" --keyring "$1" --with-colons --fingerprint | while read publine; do + # search for a public key + if [ "${publine%%:*}" != 'pub' ]; then continue; fi + # search for the associated fingerprint (should be the very next line) + while read fprline; do + if [ "${fprline%%:*}" = 'sub' ]; then break; # should never happen + elif [ "${fprline%%:*}" != 'fpr' ]; then continue; fi + echo "$fprline" | cut -d':' -f 10 + done + # order in the keyring shouldn't be important + done | sort +} + +add_keys_with_verify_against_master_keyring() { + ADD_KEYRING="$1" + MASTER="$2" + + if [ ! -f "$ADD_KEYRING" ]; then + apt_error "Keyring '$ADD_KEYRING' to be added not found" + return + fi + if [ ! -f "$MASTER" ]; then + apt_error "Master-Keyring '$MASTER' not found" + return + fi + + # when adding new keys, make sure that the archive-master-keyring + # is honored. so: + # all keys that are exported must have a valid signature + # from a key in the $distro-master-keyring + add_keys="$(get_fingerprints_of_keyring "$ADD_KEYRING")" + all_add_keys="$(aptkey_execute "$GPG_SH" --keyring "$ADD_KEYRING" --with-colons --list-keys | grep ^[ps]ub | cut -d: -f5)" + master_keys="$(aptkey_execute "$GPG_SH" --keyring "$MASTER" --with-colons --list-keys | grep ^pub | cut -d: -f5)" + + # ensure there are no colisions LP: #857472 + for all_add_key in $all_add_keys; do + for master_key in $master_keys; do + if [ "$all_add_key" = "$master_key" ]; then + echo >&2 "Keyid collision for '$all_add_key' detected, operation aborted" + return 1 + fi + done + done + + for add_key in $add_keys; do + # export the add keyring one-by-one + local TMP_KEYRING="${GPGHOMEDIR}/tmp-keyring.gpg" + aptkey_execute "$GPG_SH" --batch --yes --keyring "$ADD_KEYRING" --output "$TMP_KEYRING" --export "$add_key" + if ! aptkey_execute "$GPG_SH" --batch --yes --keyring "$TMP_KEYRING" --import "$MASTER" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + cat >&2 "${GPGHOMEDIR}/gpgoutput.log" + false + fi + # check if signed with the master key and only add in this case + ADDED=0 + for master_key in $master_keys; do + if aptkey_execute "$GPG_SH" --keyring "$TMP_KEYRING" --check-sigs --with-colons "$add_key" \ + | grep '^sig:!:' | cut -d: -f5 | grep -q "$master_key"; then + aptkey_execute "$GPG_SH" --batch --yes --keyring "$ADD_KEYRING" --export "$add_key" \ + | aptkey_execute "$GPG" --batch --yes --import + ADDED=1 + fi + done + if [ $ADDED = 0 ]; then + echo >&2 "Key '$add_key' not added. It is not signed with a master key" + fi + rm -f "${TMP_KEYRING}" + done +} + +# update the current archive signing keyring from a network URI +# the archive-keyring keys needs to be signed with the master key +# (otherwise it does not make sense from a security POV) +net_update() { + local APT_DIR='/' + eval $(apt-config shell APT_DIR Dir) + + # Disabled for now as code is insecure (LP: #1013639 (and 857472, 1013128)) + APT_KEY_NET_UPDATE_ENABLED="" + eval $(apt-config shell APT_KEY_NET_UPDATE_ENABLED APT::Key::Net-Update-Enabled) + if [ -z "$APT_KEY_NET_UPDATE_ENABLED" ]; then + exit 1 + fi + + if [ -z "$ARCHIVE_KEYRING_URI" ]; then + apt_error 'Your distribution is not supported in net-update as no uri for the archive-keyring is set' + exit 1 + fi + # in theory we would need to depend on wget for this, but this feature + # isn't usable in debian anyway as we have no keyring uri nor a master key + if ! command_available 'wget'; then + apt_error 'wget is required for a network-based update, but it is not installed' + exit 1 + fi + if [ ! -d "${APT_DIR}/var/lib/apt/keyrings" ]; then + mkdir -p "${APT_DIR}/var/lib/apt/keyrings" + fi + keyring="${APT_DIR}/var/lib/apt/keyrings/$(basename "$ARCHIVE_KEYRING_URI")" + old_mtime=0 + if [ -e $keyring ]; then + old_mtime=$(stat -c %Y "$keyring") + fi + (cd "${APT_DIR}/var/lib/apt/keyrings"; wget --timeout=90 -q -N "$ARCHIVE_KEYRING_URI") + if [ ! -e "$keyring" ]; then + return + fi + new_mtime=$(stat -c %Y "$keyring") + if [ $new_mtime -ne $old_mtime ]; then + aptkey_echo "Checking for new archive signing keys now" + add_keys_with_verify_against_master_keyring "$keyring" "$MASTER_KEYRING" + fi +} + +update() { + if [ -z "$APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE" ]; then + echo >&2 "Warning: 'apt-key update' is deprecated and should not be used anymore!" + if [ -z "$ARCHIVE_KEYRING" ]; then + echo >&2 "Note: In your distribution this command is a no-op and can therefore be removed safely." + exit 0 + fi + fi + if [ ! -f "$ARCHIVE_KEYRING" ]; then + apt_error "Can't find the archive-keyring (Is the &keyring-package; package installed?)" + exit 1 + fi + + # add new keys from the package; + + # we do not use add_keys_with_verify_against_master_keyring here, + # because "update" is run on regular package updates. A + # attacker might as well replace the master-archive-keyring file + # in the package and add his own keys. so this check wouldn't + # add any security. we *need* this check on net-update though + import_keyring_into_keyring "$ARCHIVE_KEYRING" '' && cat "${GPGHOMEDIR}/gpgoutput.log" + + if [ -r "$REMOVED_KEYS" ]; then + # remove no-longer supported/used keys + get_fingerprints_of_keyring "$(dearmor_filename "$REMOVED_KEYS")" | while read key; do + foreach_keyring_do 'remove_key_from_keyring' "$key" + done + else + apt_warn "Removed keys keyring '$REMOVED_KEYS' missing or not readable" + fi +} + +remove_key_from_keyring() { + local KEYRINGFILE="$1" + shift + # non-existent keyrings have by definition no keys + if [ ! -e "$KEYRINGFILE" ]; then + return + fi + + local FINGERPRINTS="${GPGHOMEDIR}/keyringfile.keylst" + local DEARMOR="$(dearmor_filename "$KEYRINGFILE")" + get_fingerprints_of_keyring "$DEARMOR" > "$FINGERPRINTS" + + for KEY in "$@"; do + # strip leading 0x, if present: + KEY="$(echo "${KEY#0x}" | tr -d ' ')" + + # check if the key is in this keyring + if ! grep -iq "^[0-9A-F]*${KEY}$" "$FINGERPRINTS"; then + continue + fi + if [ ! -w "$KEYRINGFILE" ]; then + apt_warn "Key ${KEY} is in keyring ${KEYRINGFILE}, but can't be removed as it is read only." + continue + fi + # check if it is the only key in the keyring and if so remove the keyring altogether + if [ '1' = "$(uniq "$FINGERPRINTS" | wc -l)" ]; then + mv -f "$KEYRINGFILE" "${KEYRINGFILE}~" # behave like gpg + return + fi + # we can't just modify pointed to files as these might be in /usr or something + local REALTARGET + if [ -L "$DEARMOR" ]; then + REALTARGET="$(readlink -f "$DEARMOR")" + mv -f "$DEARMOR" "${DEARMOR}.dpkg-tmp" + cp -a "$REALTARGET" "$DEARMOR" + fi + # delete the key from the keyring + aptkey_execute "$GPG_SH" --keyring "$DEARMOR" --batch --delete-keys --yes "$KEY" + if [ -n "$REALTARGET" ]; then + # the real backup is the old link, not the copy we made + mv -f "${DEARMOR}.dpkg-tmp" "${DEARMOR}~" + fi + if [ "$DEARMOR" != "$KEYRINGFILE" ]; then + mv -f "$KEYRINGFILE" "${KEYRINGFILE}~" + create_new_keyring "$KEYRINGFILE" + aptkey_execute "$GPG_SH" --keyring "$DEARMOR" --armor --export > "$KEYRINGFILE" + fi + get_fingerprints_of_keyring "$DEARMOR" > "$FINGERPRINTS" + done +} + +accessible_file_exists() { + if ! test -s "$1"; then + return 1 + fi + if test -r "$1"; then + return 0 + fi + apt_warn "The key(s) in the keyring $1 are ignored as the file is not readable by user '$USER' executing apt-key." + return 1 +} + +is_supported_keyring() { + # empty files are always supported + if ! test -s "$1"; then + return 0 + fi + local FILEEXT="${1##*.}" + if [ "$FILEEXT" = 'gpg' ]; then + # 0x98, 0x99 and 0xC6 via octal as hex isn't supported by dashs printf + if printf '\231' | cmp --silent --bytes=1 - "$1"; then + true + elif printf '\230' | cmp --silent --bytes=1 - "$1"; then + true + elif printf '\306' | cmp --silent --bytes=1 - "$1"; then + true + else + apt_warn "The key(s) in the keyring $1 are ignored as the file has an unsupported filetype." + return 1 + fi + elif [ "$FILEEXT" = 'asc' ]; then + true #dearmor_filename will deal with them + else + # most callers ignore unsupported extensions silently + apt_warn "The key(s) in the keyring $1 are ignored as the file has an unsupported filename extension." + return 1 + fi + return 0 +} + +foreach_keyring_do() { + local ACTION="$1" + shift + # if a --keyring was given, just work on this one + if [ -n "$FORCED_KEYRING" ]; then + $ACTION "$FORCED_KEYRING" "$@" + else + # otherwise all known keyrings are up for inspection + if accessible_file_exists "$TRUSTEDFILE" && is_supported_keyring "$TRUSTEDFILE"; then + $ACTION "$TRUSTEDFILE" "$@" + fi + local TRUSTEDPARTS="/etc/apt/trusted.gpg.d" + eval "$(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)" + if [ -d "$TRUSTEDPARTS" ]; then + TRUSTEDPARTS="$(readlink -f "$TRUSTEDPARTS")" + local TRUSTEDPARTSLIST="$(cd /; find "$TRUSTEDPARTS" -mindepth 1 -maxdepth 1 \( -name '*.gpg' -o -name '*.asc' \))" + for trusted in $(echo "$TRUSTEDPARTSLIST" | sort); do + if accessible_file_exists "$trusted" && is_supported_keyring "$trusted"; then + $ACTION "$trusted" "$@" + fi + done + fi + fi +} + +list_keys_in_keyring() { + local KEYRINGFILE="$1" + shift + # fingerprint and co will fail if key isn't in this keyring + aptkey_execute "$GPG_SH" --keyring "$(dearmor_filename "$KEYRINGFILE")" "$@" > "${GPGHOMEDIR}/gpgoutput.log" 2> "${GPGHOMEDIR}/gpgoutput.err" || true + if [ ! -s "${GPGHOMEDIR}/gpgoutput.log" ]; then + return + fi + # we fake gpg header here to refer to the real asc file rather than a temp file + if [ "${KEYRINGFILE##*.}" = 'asc' ]; then + if expr match "$(sed -n '2p' "${GPGHOMEDIR}/gpgoutput.log")" '^-\+$' >/dev/null 2>&1; then + echo "$KEYRINGFILE" + echo "$KEYRINGFILE" | sed 's#[^-]#-#g' + sed '1,2d' "${GPGHOMEDIR}/gpgoutput.log" || true + else + cat "${GPGHOMEDIR}/gpgoutput.log" + fi + else + cat "${GPGHOMEDIR}/gpgoutput.log" + fi + if [ -s "${GPGHOMEDIR}/gpgoutput.err" ]; then + cat >&2 "${GPGHOMEDIR}/gpgoutput.err" + fi +} + +export_key_from_to() { + local FROM="$1" + local TO="$2" + shift 2 + if ! aptkey_execute "$GPG_SH" --keyring "$(dearmor_filename "$FROM")" --export "$@" > "$TO" 2> "${GPGHOMEDIR}/gpgoutput.log"; then + cat >&2 "${GPGHOMEDIR}/gpgoutput.log" + false + else + chmod 0644 -- "$TO" + fi +} + +import_keyring_into_keyring() { + local FROM="${1:-${GPGHOMEDIR}/pubring.gpg}" + local TO="${2:-${GPGHOMEDIR}/pubring.gpg}" + shift 2 + rm -f "${GPGHOMEDIR}/gpgoutput.log" + # the idea is simple: We take keys from one keyring and copy it to another + # we do this with so many checks in between to ensure that WE control the + # creation, so we know that the (potentially) created $TO keyring is a + # simple keyring rather than a keybox as gpg2 would create it which in turn + # can't be read by gpgv. + # BEWARE: This is designed more in the way to work with the current + # callers, than to have a well defined it would be easy to add new callers to. + if [ ! -s "$TO" ]; then + if [ -s "$FROM" ]; then + if [ -z "$2" ]; then + local OPTS + if [ "${TO##*.}" = 'asc' ]; then + OPTS='--armor' + fi + export_key_from_to "$(dearmor_filename "$FROM")" "$TO" $OPTS ${1:+"$1"} + else + create_new_keyring "$TO" + fi + else + create_new_keyring "$TO" + fi + elif [ -s "$FROM" ]; then + local EXPORTLIMIT="$1" + if [ -n "$1$2" ]; then shift; fi + local DEARMORTO="$(dearmor_filename "$TO")" + if ! aptkey_execute "$GPG_SH" --keyring "$(dearmor_filename "$FROM")" --export ${EXPORTLIMIT:+"$EXPORTLIMIT"} \ + | aptkey_execute "$GPG_SH" --keyring "$DEARMORTO" --batch --import "$@" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + cat >&2 "${GPGHOMEDIR}/gpgoutput.log" + false + fi + if [ "$DEARMORTO" != "$TO" ]; then + export_key_from_to "$DEARMORTO" "${DEARMORTO}.asc" --armor + if ! cmp -s "$TO" "${DEARMORTO}.asc" 2>/dev/null; then + cp -a "$TO" "${TO}~" + mv -f "${DEARMORTO}.asc" "$TO" + fi + fi + fi +} + +dearmor_keyring() { + # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=831409#67 + # The awk script is more complex through to skip surrounding garbage and + # to support multiple keys in one file (old gpgs generate version headers + # which get printed with the original and hence result in garbage input for base64 + awk '/^-----BEGIN/{ x = 1; } +/^$/{ if (x == 1) { x = 2; }; } +/^[^=-]/{ if (x == 2) { print $0; }; } +/^-----END/{ x = 0; }' | base64 -d +} +dearmor_filename() { + if [ "${1##*.}" = 'asc' ]; then + local trusted="${GPGHOMEDIR}/${1##*/}.gpg" + if [ -s "$1" ]; then + dearmor_keyring < "$1" > "$trusted" + fi + echo "$trusted" + elif [ "${1##*.}" = 'gpg' ]; then + echo "$1" + elif [ "$(head -n 1 "$1" 2>/dev/null)" = '-----BEGIN PGP PUBLIC KEY BLOCK-----' ]; then + local trusted="${GPGHOMEDIR}/${1##*/}.gpg" + dearmor_keyring < "$1" > "$trusted" + echo "$trusted" + else + echo "$1" + fi +} +catfile() { + cat "$(dearmor_filename "$1")" >> "$2" +} + +merge_all_trusted_keyrings_into_pubring() { + # does the same as: + # foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg" + # but without using gpg, just cat and find + local PUBRING="$(readlink -f "${GPGHOMEDIR}")/pubring.gpg" + rm -f "$PUBRING" + touch "$PUBRING" + foreach_keyring_do 'catfile' "$PUBRING" +} + +import_keys_from_keyring() { + import_keyring_into_keyring "$1" "$2" +} + +merge_keys_into_keyrings() { + import_keyring_into_keyring "$2" "$1" '' --import-options 'merge-only' +} + +merge_back_changes() { + if [ -n "$FORCED_KEYRING" ]; then + # if the keyring was forced merge is already done + if [ "$FORCED_KEYRING" != "$TRUSTEDFILE" ]; then + mv -f "$FORCED_KEYRING" "${FORCED_KEYRING}~" + export_key_from_to "$TRUSTEDFILE" "$FORCED_KEYRING" --armor + fi + return + fi + if [ -s "${GPGHOMEDIR}/pubring.gpg" ]; then + # merge all updated keys + foreach_keyring_do 'merge_keys_into_keyrings' "${GPGHOMEDIR}/pubring.gpg" + fi + # look for keys which were added or removed + get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.orig.gpg" > "${GPGHOMEDIR}/pubring.orig.keylst" + get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.gpg" > "${GPGHOMEDIR}/pubring.keylst" + comm -3 "${GPGHOMEDIR}/pubring.keylst" "${GPGHOMEDIR}/pubring.orig.keylst" > "${GPGHOMEDIR}/pubring.diff" + # key isn't part of new keyring, so remove + cut -f 2 "${GPGHOMEDIR}/pubring.diff" | while read key; do + if [ -z "$key" ]; then continue; fi + foreach_keyring_do 'remove_key_from_keyring' "$key" + done + # key is only part of new keyring, so we need to import it + cut -f 1 "${GPGHOMEDIR}/pubring.diff" | while read key; do + if [ -z "$key" ]; then continue; fi + import_keyring_into_keyring '' "$TRUSTEDFILE" "$key" + done +} + +setup_merged_keyring() { + if [ -n "$FORCED_KEYID" ]; then + merge_all_trusted_keyrings_into_pubring + FORCED_KEYRING="${GPGHOMEDIR}/forcedkeyid.gpg" + TRUSTEDFILE="${FORCED_KEYRING}" + echo "#!/bin/sh +exec sh '($(escape_shell "${GPG}")' --keyring '$(escape_shell "${TRUSTEDFILE}")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh" + GPG="${GPGHOMEDIR}/gpg.1.sh" + # ignore error as this "just" means we haven't found the forced keyid and the keyring will be empty + import_keyring_into_keyring '' "$TRUSTEDFILE" "$FORCED_KEYID" || true + elif [ -z "$FORCED_KEYRING" ]; then + merge_all_trusted_keyrings_into_pubring + if [ -r "${GPGHOMEDIR}/pubring.gpg" ]; then + cp -a "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg" + else + touch "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg" + fi + echo "#!/bin/sh +exec sh '$(escape_shell "${GPG}")' --keyring '$(escape_shell "${GPGHOMEDIR}/pubring.gpg")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh" + GPG="${GPGHOMEDIR}/gpg.1.sh" + else + TRUSTEDFILE="$(dearmor_filename "$FORCED_KEYRING")" + create_new_keyring "$TRUSTEDFILE" + echo "#!/bin/sh +exec sh '$(escape_shell "${GPG}")' --keyring '$(escape_shell "${TRUSTEDFILE}")' \"\$@\"" > "${GPGHOMEDIR}/gpg.1.sh" + GPG="${GPGHOMEDIR}/gpg.1.sh" + fi +} + +create_new_keyring() { + # gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead. + if ! [ -e "$1" ]; then + if [ -w "$(dirname "$1")" ]; then + touch -- "$1" + chmod 0644 -- "$1" + fi + fi +} + +aptkey_execute() { sh "$@"; } + +usage() { + echo "Usage: apt-key [--keyring file] [command] [arguments]" + echo + echo "Manage apt's list of trusted keys" + echo + echo " apt-key add <file> - add the key contained in <file> ('-' for stdin)" + echo " apt-key del <keyid> - remove the key <keyid>" + echo " apt-key export <keyid> - output the key <keyid>" + echo " apt-key exportall - output all trusted keys" + echo " apt-key update - update keys using the keyring package" + echo " apt-key net-update - update keys using the network" + echo " apt-key list - list keys" + echo " apt-key finger - list fingerprints" + echo " apt-key adv - pass advanced options to gpg (download key)" + echo + echo "If no specific keyring file is given the command applies to all keyring files." +} + +while [ -n "$1" ]; do + case "$1" in + --keyring) + shift + if [ -z "$FORCED_KEYRING" -o "$FORCED_KEYRING" = '/dev/null' ]; then + TRUSTEDFILE="$1" + FORCED_KEYRING="$1" + elif [ "$TRUSTEDFILE" = "$FORCED_KEYRING" ]; then + create_gpg_home + FORCED_KEYRING="${GPGHOMEDIR}/mergedkeyrings.gpg" + echo -n '' > "$FORCED_KEYRING" + chmod 0644 -- "$FORCED_KEYRING" + catfile "$TRUSTEDFILE" "$FORCED_KEYRING" + catfile "$1" "$FORCED_KEYRING" + else + catfile "$1" "$FORCED_KEYRING" + fi + ;; + --keyid) + shift + if [ -n "$FORCED_KEYID" ]; then + apt_error 'Specifying --keyid multiple times is not supported' + exit 1 + fi + FORCED_KEYID="$1" + ;; + --secret-keyring) + shift + FORCED_SECRET_KEYRING="$1" + ;; + --readonly) + merge_back_changes() { true; } + create_new_keyring() { if [ ! -r "$FORCED_KEYRING" ]; then TRUSTEDFILE='/dev/null'; FORCED_KEYRING="$TRUSTEDFILE"; fi; } + ;; + --fakeroot) + requires_root() { true; } + ;; + --quiet) + aptkey_echo() { true; } + ;; + --debug1) + # some cmds like finger redirect stderr to /dev/null … + aptkey_execute() { echo 'EXEC:' "$@"; sh "$@"; } + ;; + --debug2) + # … other more complicated ones pipe gpg into gpg. + aptkey_execute() { echo >&2 'EXEC:' "$@"; sh "$@"; } + ;; + --homedir) + # force usage of a specific homedir instead of creating a temporary + shift + GPGHOMEDIR="$1" + ;; + --*) + echo >&2 "Unknown option: $1" + usage + exit 1;; + *) + break;; + esac + shift +done + +if [ -z "$TRUSTEDFILE" ]; then + TRUSTEDFILE="/etc/apt/trusted.gpg" + eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring) + eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f) +fi + +command="$1" +if [ -z "$command" ]; then + usage + exit 1 +fi +shift + +prepare_gpg_home() { + # crude detection if we are called from a maintainerscript where the + # package depends on gnupg or not. We accept recommends here as + # well as the script hopefully uses apt-key optionally then like e.g. + # debian-archive-keyring for (upgrade) cleanup did + if [ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] && [ -z "$APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE" ]; then + if ! dpkg-query --show --showformat '${Pre-Depends}${Depends}${Recommends}\n' "$DPKG_MAINTSCRIPT_PACKAGE" 2>/dev/null | grep -E -q 'gpg|gnupg'; then + cat >&2 <<EOF +Warning: The $DPKG_MAINTSCRIPT_NAME maintainerscript of the package $DPKG_MAINTSCRIPT_PACKAGE +Warning: seems to use apt-key (provided by apt) without depending on gpg, gnupg, or gnupg2. +Warning: This will BREAK in the future and should be fixed by the package maintainer(s). +Note: Check first if apt-key functionality is needed at all - it probably isn't! +EOF + fi + fi + eval "$(apt-config shell GPG_EXE Apt::Key::gpgcommand)" + if [ -n "$GPG_EXE" ] && command_available "$GPG_EXE"; then + true + elif command_available 'gpg'; then + GPG_EXE="gpg" + elif command_available 'gpg2'; then + GPG_EXE="gpg2" + elif command_available 'gpg1'; then + GPG_EXE="gpg1" + else + apt_error 'gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation' + exit 255 + fi + + create_gpg_home + + # now tell gpg that it shouldn't try to maintain this trustdb file + echo "#!/bin/sh +exec '$(escape_shell "${GPG_EXE}")' --ignore-time-conflict --no-options --no-default-keyring \\ +--homedir '$(escape_shell "${GPGHOMEDIR}")' --no-auto-check-trustdb --trust-model always \"\$@\"" > "${GPGHOMEDIR}/gpg.0.sh" + GPG_SH="${GPGHOMEDIR}/gpg.0.sh" + GPG="$GPG_SH" + + # create the trustdb with an (empty) dummy keyring + # older gpgs required it, newer gpgs even warn that it isn't needed, + # but require it nonetheless for some commands, so we just play safe + # here for the foreseeable future and create a dummy one + touch "${GPGHOMEDIR}/empty.gpg" + if ! "$GPG_EXE" --ignore-time-conflict --no-options --no-default-keyring \ + --homedir "$GPGHOMEDIR" --quiet --check-trustdb --keyring "${GPGHOMEDIR}/empty.gpg" >"${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + cat >&2 "${GPGHOMEDIR}/gpgoutput.log" + false + fi + + # We don't usually need a secret keyring, of course, but + # for advanced operations, we might really need a secret keyring after all + if [ -n "$FORCED_SECRET_KEYRING" ] && [ -r "$FORCED_SECRET_KEYRING" ]; then + if ! aptkey_execute "$GPG" -v --batch --import "$FORCED_SECRET_KEYRING" >"${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + # already imported keys cause gpg1 to fail for some reason… ignore this error + if ! grep -q 'already in secret keyring' "${GPGHOMEDIR}/gpgoutput.log"; then + cat >&2 "${GPGHOMEDIR}/gpgoutput.log" + false + fi + fi + else + # and then, there are older versions of gpg which panic and implode + # if there isn't one available - and writeable for imports + # and even if not output is littered with the creation of a secring, + # so lets call import once to have it create what it wants in silence + echo -n | aptkey_execute "$GPG" --batch --import >/dev/null 2>&1 || true + fi +} + +warn_on_script_usage() { + if [ -n "$APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE" ]; then + return + fi + # (Maintainer) scripts should not be using apt-key + if [ -n "$DPKG_MAINTSCRIPT_PACKAGE" ]; then + echo >&2 "Warning: apt-key should not be used in scripts (called from $DPKG_MAINTSCRIPT_NAME maintainerscript of the package ${DPKG_MAINTSCRIPT_PACKAGE})" + fi + + echo >&2 "Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8))." +} + +warn_outside_maintscript() { + # In del, we want to warn in interactive use, but not inside maintainer + # scripts, so as to give people a chance to migrate keyrings. + # + # FIXME: We should always warn starting in 2022. + if [ -z "$DPKG_MAINTSCRIPT_PACKAGE" ]; then + echo >&2 "Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8))." + fi +} + +if [ "$command" != 'help' ] && [ "$command" != 'verify' ]; then + prepare_gpg_home +fi + +case "$command" in + add) + warn_on_script_usage + requires_root + setup_merged_keyring + aptkey_execute "$GPG" --quiet --batch --import "$@" + merge_back_changes + aptkey_echo "OK" + ;; + del|rm|remove) + # no script warning here as removing 'add' usage needs 'del' for cleanup + warn_outside_maintscript + requires_root + foreach_keyring_do 'remove_key_from_keyring' "$@" + aptkey_echo "OK" + ;; + update) + warn_on_script_usage + requires_root + setup_merged_keyring + update + merge_back_changes + ;; + net-update) + warn_on_script_usage + requires_root + setup_merged_keyring + net_update + merge_back_changes + ;; + list|finger*) + warn_on_script_usage + foreach_keyring_do 'list_keys_in_keyring' --fingerprint "$@" + ;; + export|exportall) + warn_on_script_usage + merge_all_trusted_keyrings_into_pubring + aptkey_execute "$GPG_SH" --keyring "${GPGHOMEDIR}/pubring.gpg" --armor --export "$@" + ;; + adv*) + warn_on_script_usage + setup_merged_keyring + aptkey_echo "Executing: $GPG" "$@" + aptkey_execute "$GPG" "$@" + merge_back_changes + ;; + verify) + GPGV='' + eval $(apt-config shell GPGV Apt::Key::gpgvcommand) + if [ -n "$GPGV" ] && command_available "$GPGV"; then true; + elif command_available 'gpgv'; then GPGV='gpgv'; + elif command_available 'gpgv2'; then GPGV='gpgv2'; + elif command_available 'gpgv1'; then GPGV='gpgv1'; + else + apt_error 'gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed' + exit 29 + fi + # for a forced keyid we need gpg --export, so full wrapping required + if [ -n "$FORCED_KEYID" ]; then + prepare_gpg_home + else + create_gpg_home + fi + setup_merged_keyring + if [ -n "$FORCED_KEYRING" ]; then + "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "$(dearmor_filename "${FORCED_KEYRING}")" --ignore-time-conflict "$@" + else + "$GPGV" --homedir "${GPGHOMEDIR}" --keyring "${GPGHOMEDIR}/pubring.gpg" --ignore-time-conflict "$@" + fi + ;; + help) + usage + ;; + *) + usage + exit 1 + ;; +esac |