diff options
Diffstat (limited to 'cmdline/apt-key.in')
| -rw-r--r-- | cmdline/apt-key.in | 407 |
1 files changed, 260 insertions, 147 deletions
diff --git a/cmdline/apt-key.in b/cmdline/apt-key.in index 0774cf4b7..cf0b9a96f 100644 --- a/cmdline/apt-key.in +++ b/cmdline/apt-key.in @@ -3,29 +3,6 @@ set -e unset GREP_OPTIONS -GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring" - -# 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 -GPGHOMEDIR="$(mktemp -d)" -CURRENTTRAP="${CURRENTTRAP} rm -rf '${GPGHOMEDIR}';" -trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM -chmod 700 "$GPGHOMEDIR" -# We don't use a secret keyring, of course, but gpg panics and -# implodes if there isn't one available - and writeable for imports -SECRETKEYRING="${GPGHOMEDIR}/secring.gpg" -touch $SECRETKEYRING -GPG_CMD="$GPG_CMD --homedir $GPGHOMEDIR" -# create the trustdb with an (empty) dummy keyring -# older gpgs required it, newer gpgs even warn that it isn't needed, -# but require it nonetheless for some commands, so we just play safe -# here for the foreseeable future and create a dummy one -$GPG_CMD --quiet --check-trustdb --keyring $SECRETKEYRING >/dev/null 2>&1 -# tell gpg that it shouldn't try to maintain a trustdb file -GPG_CMD="$GPG_CMD --no-auto-check-trustdb --trust-model always" - -GPG="$GPG_CMD" - APT_DIR="/" eval $(apt-config shell APT_DIR Dir) @@ -37,22 +14,26 @@ REMOVED_KEYS='&keyring-removed-filename;' eval $(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys) ARCHIVE_KEYRING_URI='&keyring-uri;' eval $(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI) -TMP_KEYRING=${APT_DIR}/var/lib/apt/keyrings/maybe-import-keyring.gpg + +aptkey_echo() { echo "$@"; } requires_root() { if [ "$(id -u)" -ne 0 ]; then - echo >&1 "ERROR: This command can only be used by root." + echo >&2 "ERROR: This command can only be used by root." exit 1 fi } -# gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead. -init_keyring() { - for path; do - if ! [ -e "$path" ]; then - touch -- "$path" - chmod 0644 -- "$path" - fi +get_fingerprints_of_keyring() { + $GPG_CMD --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 done } @@ -61,11 +42,11 @@ add_keys_with_verify_against_master_keyring() { MASTER=$2 if [ ! -f "$ADD_KEYRING" ]; then - echo "ERROR: '$ADD_KEYRING' not found" + echo >&2 "ERROR: '$ADD_KEYRING' not found" return - fi + fi if [ ! -f "$MASTER" ]; then - echo "ERROR: '$MASTER' not found" + echo >&2 "ERROR: '$MASTER' not found" return fi @@ -73,7 +54,7 @@ add_keys_with_verify_against_master_keyring() { # is honored. so: # all keys that are exported must have a valid signature # from a key in the $distro-master-keyring - add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5` + add_keys="$(get_fingerprints_of_keyring "$ADD_KEYRING")" all_add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^[ps]ub | cut -d: -f5` master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5` @@ -86,24 +67,28 @@ add_keys_with_verify_against_master_keyring() { fi done done - + for add_key in $add_keys; do # export the add keyring one-by-one - rm -f $TMP_KEYRING - $GPG_CMD --keyring $ADD_KEYRING --output $TMP_KEYRING --export $add_key - # check if signed with the master key and only add in this case - ADDED=0 + local TMP_KEYRING="${GPGHOMEDIR}/tmp-keyring.gpg" + $GPG_CMD --batch --yes --keyring "$ADD_KEYRING" --output "$TMP_KEYRING" --export "$add_key" + if ! $GPG_CMD --batch --yes --keyring "$TMP_KEYRING" --import "$MASTER" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + cat "${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 $GPG_CMD --keyring $MASTER --keyring $TMP_KEYRING --check-sigs --with-colons $add_key | grep '^sig:!:' | cut -d: -f5 | grep -q $master_key; then - $GPG --import $TMP_KEYRING + if $GPG_CMD --keyring $TMP_KEYRING --check-sigs --with-colons $add_key | grep '^sig:!:' | cut -d: -f5 | grep -q $master_key; then + $GPG_CMD --batch --yes --keyring "$ADD_KEYRING" --export "$add_key" | $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 - rm -f $TMP_KEYRING } # update the current archive signing keyring from a network URI @@ -121,7 +106,6 @@ net_update() { echo >&2 "ERROR: Your distribution is not supported in net-update as no uri for the archive-keyring is set" exit 1 fi - requires_root # in theory we would need to depend on wget for this, but this feature # isn't useable in debian anyway as we have no keyring uri nor a master key if ! which wget >/dev/null 2>&1; then @@ -142,7 +126,7 @@ net_update() { fi new_mtime=$(stat -c %Y $keyring) if [ $new_mtime -ne $old_mtime ]; then - echo "Checking for new archive signing keys now" + aptkey_echo "Checking for new archive signing keys now" add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING fi } @@ -153,7 +137,6 @@ update() { echo >&2 "Is the &keyring-package; package installed?" exit 1 fi - requires_root # add new keys from the package; @@ -166,71 +149,159 @@ update() { if [ -r "$REMOVED_KEYS" ]; then # remove no-longer supported/used keys - keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5` - for key in $keys; do - if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then - $GPG --quiet --batch --delete-key --yes ${key} - fi + get_fingerprints_of_keyring "$REMOVED_KEYS" | while read key; do + foreach_keyring_do 'remove_key_from_keyring' "$key" done else - echo "Warning: removed keys keyring $REMOVED_KEYS missing or not readable" >&2 + echo >&2 "Warning: removed keys keyring $REMOVED_KEYS missing or not readable" fi } remove_key_from_keyring() { - local GPG="$GPG_CMD --keyring $1" - # check if the key is in this keyring: the key id is in the 5 column at the end - if ! $GPG --with-colons --list-keys 2>&1 | grep -q "^pub:[^:]*:[^:]*:[^:]*:[0-9A-F]\+$2:"; then - return - fi - if [ ! -w "$1" ]; then - echo >&2 "Key ${2} is in keyring ${1}, but can't be removed as it is read only." - return + local KEYRINGFILE="$1" + shift + # non-existent keyrings have by definition no keys + if [ ! -e "$KEYRINGFILE" ]; then + return fi - # check if it is the only key in the keyring and if so remove the keyring altogether - if [ '1' = "$($GPG --with-colons --list-keys | grep "^pub:[^:]*:[^:]*:[^:]*:[0-9A-F]\+:" | wc -l)" ]; then - mv -f "$1" "${1}~" # 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 "$1" ]; then - REALTARGET="$(readlink -f "$1")" - mv -f "$1" "${1}.dpkg-tmp" - cp -a "$REALTARGET" "$1" - ls "$(dirname $1)" - fi - # delete the key from the keyring - $GPG --batch --delete-key --yes "$2" - if [ -n "$REALTARGET" ]; then - # the real backup is the old link, not the copy we made - mv -f "${1}.dpkg-tmp" "${1}~" - fi -} -remove_key() { - requires_root + local GPG="$GPG_CMD --keyring $KEYRINGFILE" + for KEY in "$@"; do + # check if the key is in this keyring: the key id is in the 5 column at the end + if ! get_fingerprints_of_keyring "$KEYRINGFILE" | grep -q "^[0-9A-F]*${KEY}$"; then + continue + fi + if [ ! -w "$KEYRINGFILE" ]; then + echo >&2 "Key ${KEY} is in keyring ${KEYRINGFILE}, but can't be removed as it is read only." + continue + fi + # check if it is the only key in the keyring and if so remove the keyring altogether + if [ '1' = "$(get_fingerprints_of_keyring "$KEYRINGFILE" | wc -l)" ]; then + mv -f "$KEYRINGFILE" "${KEYRINGFILE}~" # behave like gpg + return + fi + # we can't just modify pointed to files as these might be in /usr or something + local REALTARGET + if [ -L "$KEYRINGFILE" ]; then + REALTARGET="$(readlink -f "$KEYRINGFILE")" + mv -f "$KEYRINGFILE" "${KEYRINGFILE}.dpkg-tmp" + cp -a "$REALTARGET" "$KEYRINGFILE" + fi + # delete the key from the keyring + $GPG --batch --delete-key --yes "$KEY" + if [ -n "$REALTARGET" ]; then + # the real backup is the old link, not the copy we made + mv -f "${KEYRINGFILE}.dpkg-tmp" "${KEYRINGFILE}~" + fi + done +} - # if a --keyring was given, just remove from there - if [ -n "$FORCED_KEYRING" ]; then - remove_key_from_keyring "$FORCED_KEYRING" "$1" - else +foreach_keyring_do() { + local ACTION="$1" + shift + # if a --keyring was given, just remove from there + if [ -n "$FORCED_KEYRING" ]; then + $ACTION "$FORCED_KEYRING" "$@" + else # otherwise all known keyrings are up for inspection - local TRUSTEDFILE="/etc/apt/trusted.gpg" - eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring) - eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f) - remove_key_from_keyring "$TRUSTEDFILE" "$1" - TRUSTEDPARTS="/etc/apt/trusted.gpg.d" + if [ -s "$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 + # strip / suffix as gpg will double-slash in that case (#665411) + local STRIPPED_TRUSTEDPARTS="${TRUSTEDPARTS%/}" + if [ "${STRIPPED_TRUSTEDPARTS}/" = "$TRUSTEDPARTS" ]; then + TRUSTEDPARTS="$STRIPPED_TRUSTEDPARTS" + fi for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do - remove_key_from_keyring "$trusted" "$1" + if [ -s "$trusted" ]; then + $ACTION "$trusted" "$@" + fi done fi + fi +} + +run_cmd_on_keyring() { + local KEYRINGFILE="$1" + shift + # fingerprint and co will fail if key isn't in this keyring + $GPG_CMD --keyring "$KEYRINGFILE" --batch "$@" 2>/dev/null || true +} + +import_keys_from_keyring() { + local IMPORT="$1" + local KEYRINGFILE="$2" + if ! $GPG_CMD --keyring "$KEYRINGFILE" --batch --import "$IMPORT" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + cat "${GPGHOMEDIR}/gpgoutput.log" + false + fi +} + +merge_keys_into_keyrings() { + local KEYRINGFILE="$1" + local IMPORT="$2" + if ! $GPG_CMD --keyring "$KEYRINGFILE" --batch --import --import-options 'merge-only' "$IMPORT" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + cat "${GPGHOMEDIR}/gpgoutput.log" + false + fi +} + +merge_back_changes() { + if [ -n "$FORCED_KEYRING" ]; then + # if the keyring was forced merge is already done + 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" + sort "${GPGHOMEDIR}/pubring.keylst" "${GPGHOMEDIR}/pubring.orig.keylst" | uniq --unique | while read key; do + if grep -q "^${key}$" "${GPGHOMEDIR}/pubring.orig.keylst"; then + # key isn't part of new keyring, so remove + foreach_keyring_do 'remove_key_from_keyring' "$key" + elif grep -q "^${key}$" "${GPGHOMEDIR}/pubring.keylst"; then + # key is part of new keyring, so we need to import it + create_new_keyring "$TRUSTEDFILE" + if ! $GPG --batch --yes --export "$key" | $GPG_CMD --keyring "$TRUSTEDFILE" --batch --yes --import > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then + cat "${GPGHOMEDIR}/gpgoutput.log" + false + fi + else + echo >&2 "Errror: Key ${key} (dis)appeared out of nowhere" + fi + done +} + +setup_merged_keyring() { + if [ -z "$FORCED_KEYRING" ]; then + foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg" + if [ -r "${GPGHOMEDIR}/pubring.gpg" ]; then + cp -a "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg" + else + touch "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg" + fi + GPG="$GPG --keyring ${GPGHOMEDIR}/pubring.gpg" + else + GPG="$GPG --keyring $TRUSTEDFILE" + create_new_keyring "$TRUSTEDFILE" fi - echo "OK" } +create_new_keyring() { + # gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead. + if ! [ -e "$TRUSTEDFILE" ]; then + if [ -w "$(dirname "$TRUSTEDFILE")" ]; then + touch -- "$TRUSTEDFILE" + chmod 0644 -- "$TRUSTEDFILE" + fi + fi +} usage() { echo "Usage: apt-key [--keyring file] [command] [arguments]" @@ -256,17 +327,19 @@ while [ -n "$1" ]; do shift TRUSTEDFILE="$1" FORCED_KEYRING="$1" - if [ -r "$TRUSTEDFILE" ] || [ "$2" = 'add' ] || [ "$2" = 'adv' ]; then - GPG="$GPG --keyring $TRUSTEDFILE --primary-keyring $TRUSTEDFILE" - else - echo >&2 "Error: The specified keyring »$TRUSTEDFILE« is missing or not readable" - exit 1 - fi + ;; + --secret-keyring) shift + FORCED_SECRET_KEYRING="$1" + ;; + --readonly) + merge_back_changes() { true; } ;; --fakeroot) requires_root() { true; } - shift + ;; + --quiet) + aptkey_echo() { true; } ;; --*) echo >&2 "Unknown option: $1" @@ -275,28 +348,13 @@ while [ -n "$1" ]; do *) break;; esac + shift done if [ -z "$TRUSTEDFILE" ]; then TRUSTEDFILE="/etc/apt/trusted.gpg" eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring) eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f) - if [ -r "$TRUSTEDFILE" ]; then - GPG="$GPG --keyring $TRUSTEDFILE" - fi - GPG="$GPG --primary-keyring $TRUSTEDFILE" - TRUSTEDPARTS="/etc/apt/trusted.gpg.d" - eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d) - if [ -d "$TRUSTEDPARTS" ]; then - # strip / suffix as gpg will double-slash in that case (#665411) - STRIPPED_TRUSTEDPARTS="${TRUSTEDPARTS%/}" - if [ "${STRIPPED_TRUSTEDPARTS}/" = "$TRUSTEDPARTS" ]; then - TRUSTEDPARTS="$STRIPPED_TRUSTEDPARTS" - fi - for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do - GPG="$GPG --keyring $trusted" - done - fi fi command="$1" @@ -306,52 +364,107 @@ if [ -z "$command" ]; then fi shift -if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then - echo >&2 "Warning: gnupg does not seem to be installed." - echo >&2 "Warning: apt-key requires gnupg for most operations." - echo >&2 +if [ "$command" != "help" ]; then + eval $(apt-config shell GPG_EXE Apt::Key::gpgcommand) + + if [ -n "$GPG_EXE" ] && which "$GPG_EXE" >/dev/null 2>&1; then + true + elif which gpg >/dev/null 2>&1; then + GPG_EXE="gpg" + elif which gpg2 >/dev/null 2>&1; then + GPG_EXE="gpg2" + else + echo >&2 "Error: gnupg or gnupg2 do not seem to be installed," + echo >&2 "Error: but apt-key requires gnupg or gnupg2 for operation." + echo >&2 + exit 255 + fi + + GPG_CMD="$GPG_EXE --ignore-time-conflict --no-options --no-default-keyring" + + # 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 + 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 -d)" + CURRENTTRAP="${CURRENTTRAP} rm -rf '${GPGHOMEDIR}';" + trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM + chmod 700 "$GPGHOMEDIR" + # We don't use a secret keyring, of course, but gpg panics and + # implodes if there isn't one available - and writeable for imports + SECRETKEYRING="${GPGHOMEDIR}/secring.gpg" + touch $SECRETKEYRING + GPG_CMD="$GPG_CMD --homedir $GPGHOMEDIR" + # 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 + $GPG_CMD --quiet --check-trustdb --keyring $SECRETKEYRING >/dev/null 2>&1 + # tell gpg that it shouldn't try to maintain a trustdb file + GPG_CMD="$GPG_CMD --no-auto-check-trustdb --trust-model always" + GPG="$GPG_CMD" + + # for advanced operations, we might really need a secret keyring after all + if [ -n "$FORCED_SECRET_KEYRING" ] && [ -r "$FORCED_SECRET_KEYRING" ]; then + rm -f "$SECRETKEYRING" + cp -a "$FORCED_SECRET_KEYRING" "$SECRETKEYRING" + fi fi case "$command" in add) - requires_root - init_keyring "$TRUSTEDFILE" - $GPG --quiet --batch --import "$1" - echo "OK" + requires_root + setup_merged_keyring + $GPG --quiet --batch --import "$@" + merge_back_changes + aptkey_echo "OK" ;; del|rm|remove) - init_keyring "$TRUSTEDFILE" - remove_key "$1" + requires_root + foreach_keyring_do 'remove_key_from_keyring' "$@" + aptkey_echo "OK" ;; update) - init_keyring "$TRUSTEDFILE" + requires_root + setup_merged_keyring update + merge_back_changes ;; net-update) - init_keyring "$TRUSTEDFILE" + requires_root + setup_merged_keyring net_update + merge_back_changes ;; list) - init_keyring "$TRUSTEDFILE" - $GPG --batch --list-keys - ;; + foreach_keyring_do 'run_cmd_on_keyring' --list-keys "$@" + ;; finger*) - init_keyring "$TRUSTEDFILE" - $GPG --batch --fingerprint - ;; - export) - init_keyring "$TRUSTEDFILE" - $GPG --armor --export "$1" - ;; - exportall) - init_keyring "$TRUSTEDFILE" - $GPG --armor --export - ;; + foreach_keyring_do 'run_cmd_on_keyring' --fingerprint "$@" + ;; + export|exportall) + foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg" + $GPG_CMD --keyring "${GPGHOMEDIR}/pubring.gpg" --armor --export "$@" + ;; adv*) - init_keyring "$TRUSTEDFILE" - echo "Executing: $GPG $*" - $GPG $* - ;; + setup_merged_keyring + aptkey_echo "Executing: $GPG $*" + $GPG "$@" + merge_back_changes + ;; + verify) + setup_merged_keyring + if which gpgv >/dev/null 2>&1; then + gpgv --homedir "${GPGHOMEDIR}" --keyring "${GPGHOMEDIR}/pubring.gpg" --ignore-time-conflict "$@" + else + $GPG --verify "$@" + fi + ;; help) usage ;; |