cmdline/apt-key

   1 #!/bin/sh
   2
   3 set -e
   4 unset GREP_OPTIONS
   5
   6 # We don't use a secret keyring, of course, but gpg panics and
   7 # implodes if there isn't one available
   8 SECRETKEYRING="$(mktemp)"
   9 trap "rm -f '${SECRETKEYRING}'" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
  10 GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring ${SECRETKEYRING}"
  11
  12 if [ "$(id -u)" -eq 0 ]; then
  13         # we could use a tmpfile here too, but creation of this tends to be time-consuming
  14         eval $(apt-config shell TRUSTDBDIR Dir::Etc/d)
  15         GPG_CMD="$GPG_CMD --trustdb-name ${TRUSTDBDIR}/trustdb.gpg"
  16 fi
  17
  18 GPG="$GPG_CMD"
  19
  20 MASTER_KEYRING=""
  21 ARCHIVE_KEYRING_URI=""
  22 #MASTER_KEYRING=/usr/share/keyrings/debian-master-keyring.gpg
  23 #ARCHIVE_KEYRING_URI=http://ftp.debian.org/debian/debian-archive-keyring.gpg
  24
  25 ARCHIVE_KEYRING=/usr/share/keyrings/debian-archive-keyring.gpg
  26 REMOVED_KEYS=/usr/share/keyrings/debian-archive-removed-keys.gpg
  27
  28 requires_root() {
  29         if [ "$(id -u)" -ne 0 ]; then
  30                 echo >&1 "ERROR: This command can only be used by root."
  31                 exit 1
  32         fi
  33 }
  34
  35 add_keys_with_verify_against_master_keyring() {
  36     ADD_KEYRING=$1
  37     MASTER=$2
  38
  39     if [ ! -f "$ADD_KEYRING" ]; then
  40         echo "ERROR: '$ADD_KEYRING' not found"
  41         return
  42     fi
  43     if [ ! -f "$MASTER" ]; then
  44         echo "ERROR: '$MASTER' not found"
  45         return
  46     fi
  47
  48     # when adding new keys, make sure that the archive-master-keyring
  49     # is honored. so:
  50     #   all keys that are exported must have a valid signature
  51     #   from a key in the $distro-master-keyring
  52     add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
  53     master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5`
  54     for add_key in $add_keys; do
  55         ADDED=0
  56         for master_key in $master_keys; do
  57             if $GPG_CMD --keyring $ADD_KEYRING --list-sigs --with-colons $add_key | grep ^sig | cut -d: -f5 | grep -q $master_key; then
  58                 $GPG_CMD --quiet --batch --keyring $ADD_KEYRING --export $add_key | $GPG --import
  59                 ADDED=1
  60             fi
  61         done
  62         if [ $ADDED = 0 ]; then
  63             echo >&2 "Key '$add_key' not added. It is not signed with a master key"
  64         fi
  65     done
  66 }
  67
  68 # update the current archive signing keyring from a network URI
  69 # the archive-keyring keys needs to be signed with the master key
  70 # (otherwise it does not make sense from a security POV)
  71 net_update() {
  72     if [ -z "$ARCHIVE_KEYRING_URI" ]; then
  73         echo >&2 "ERROR: Your distribution is not supported in net-update as no uri for the archive-keyring is set"
  74         exit 1
  75     fi
  76     requires_root
  77     # in theory we would need to depend on wget for this, but this feature
  78     # isn't useable in debian anyway as we have no keyring uri nor a master key
  79     if ! which wget >/dev/null 2>&1; then
  80         echo >&2 "ERROR: an installed wget is required for a network-based update"
  81         exit 1
  82     fi
  83     if [ ! -d /var/lib/apt/keyrings ]; then
  84         mkdir -p /var/lib/apt/keyrings
  85     fi
  86     keyring=/var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING)
  87     old_mtime=0
  88     if [ -e $keyring ]; then
  89         old_mtime=$(stat -c %Y $keyring)
  90     fi
  91     (cd  /var/lib/apt/keyrings; wget -q -N $ARCHIVE_KEYRING_URI)
  92     if [ ! -e $keyring ]; then
  93         return
  94     fi
  95     new_mtime=$(stat -c %Y $keyring)
  96     if [ $new_mtime -ne $old_mtime ]; then
  97         echo "Checking for new archive signing keys now"
  98         add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING
  99     fi
 100 }
 101
 102 update() {
 103     if [ ! -f $ARCHIVE_KEYRING ]; then
 104         echo >&2 "ERROR: Can't find the archive-keyring"
 105         echo >&2 "Is the debian-archive-keyring package installed?"
 106         exit 1
 107     fi
 108     requires_root
 109
 110     # add new keys from the package;
 111
 112     # we do not use add_keys_with_verify_against_master_keyring here,
 113     # because "update" is run on regular package updates.  A
 114     # attacker might as well replace the master-archive-keyring file
 115     # in the package and add his own keys. so this check wouldn't
 116     # add any security. we *need* this check on net-update though
 117     $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
 118
 119     if [ -r "$REMOVED_KEYS" ]; then
 120         # remove no-longer supported/used keys
 121         keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5`
 122         for key in $keys; do
 123             if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then
 124                 $GPG --quiet --batch --delete-key --yes ${key}
 125             fi
 126         done
 127     else
 128         echo "Warning: removed keys keyring  $REMOVED_KEYS missing or not readable" >&2
 129     fi
 130 }
 131
 132
 133 usage() {
 134     echo "Usage: apt-key [--keyring file] [command] [arguments]"
 135     echo
 136     echo "Manage apt's list of trusted keys"
 137     echo
 138     echo "  apt-key add <file>          - add the key contained in <file> ('-' for stdin)"
 139     echo "  apt-key del <keyid>         - remove the key <keyid>"
 140     echo "  apt-key export <keyid>      - output the key <keyid>"
 141     echo "  apt-key exportall           - output all trusted keys"
 142     echo "  apt-key update              - update keys using the keyring package"
 143     echo "  apt-key net-update          - update keys using the network"
 144     echo "  apt-key list                - list keys"
 145     echo "  apt-key finger              - list fingerprints"
 146     echo "  apt-key adv                 - pass advanced options to gpg (download key)"
 147     echo
 148     echo "If no specific keyring file is given the command applies to all keyring files."
 149 }
 150
 151 # Determine on which keyring we want to work
 152 if [ "$1" = "--keyring" ]; then
 153         #echo "keyfile given"
 154         shift
 155         TRUSTEDFILE="$1"
 156         if [ -r "$TRUSTEDFILE" ] || [ "$2" = 'add' ]; then
 157                 GPG="$GPG --keyring $TRUSTEDFILE --primary-keyring $TRUSTEDFILE"
 158         else
 159                 echo >&2 "Error: The specified keyring »$TRUSTEDFILE« is missing or not readable"
 160                 exit 1
 161         fi
 162         shift
 163 # otherwise use the default
 164 else
 165         #echo "generate list"
 166         TRUSTEDFILE="/etc/apt/trusted.gpg"
 167         eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
 168         eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
 169         if [ -r "$TRUSTEDFILE" ]; then
 170                 GPG="$GPG --keyring $TRUSTEDFILE"
 171         fi
 172         GPG="$GPG --primary-keyring $TRUSTEDFILE"
 173         TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
 174         eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
 175         if [ -d "$TRUSTEDPARTS" ]; then
 176                 #echo "parts active"
 177                 for trusted in $(run-parts --list $TRUSTEDPARTS --regex '^.*\.gpg$'); do
 178                         #echo "part -> $trusted"
 179                         GPG="$GPG --keyring $trusted"
 180                 done
 181         fi
 182 fi
 183 #echo "COMMAND: $GPG"
 184
 185 command="$1"
 186 if [ -z "$command" ]; then
 187     usage
 188     exit 1
 189 fi
 190 shift
 191
 192 if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
 193     echo >&2 "Warning: gnupg does not seem to be installed."
 194     echo >&2 "Warning: apt-key requires gnupg for most operations."
 195     echo >&2
 196 fi
 197
 198 case "$command" in
 199     add)
 200         requires_root
 201         $GPG --quiet --batch --import "$1"
 202         echo "OK"
 203         ;;
 204     del|rm|remove)
 205         requires_root
 206         $GPG --quiet --batch --delete-key --yes "$1"
 207         echo "OK"
 208         ;;
 209     update)
 210         update
 211         ;;
 212     net-update)
 213         net_update
 214         ;;
 215     list)
 216         $GPG --batch --list-keys
 217         ;;
 218     finger*)
 219         $GPG --batch --fingerprint
 220         ;;
 221     export)
 222         $GPG --armor --export "$1"
 223         ;;
 224     exportall)
 225         $GPG --armor --export
 226         ;;
 227     adv*)
 228         echo "Executing: $GPG $*"
 229         $GPG $*
 230         ;;
 231     help)
 232         usage
 233         ;;
 234     *)
 235         usage
 236         exit 1
 237         ;;
 238 esac