##################################################
# load conf file
-#. /etc/monkeysphere/monkeysphere.conf
-. ~/ms/monkeysphere.conf
-
-# user name of user to update
-USERNAME="$1"
-
-#AUTH_KEYS_DIR_BASE=/var/lib/monkeysphere/authorized_keys/
-AUTH_KEYS_DIR_BASE=~/ms/authorized_keys
-
-AUTH_KEYS_DIR="$AUTH_KEYS_DIR_BASE"/"$USERNAME"
-AUTH_KEYS_FILE="$AUTH_KEYS_DIR"/authorized_keys
-
-AUTH_USER_IDS="$AUTH_USER_IDS_DIR"/"$USERNAME"
+CONF_FILE=${CONF_FILE:-"/etc/monkeysphere/monkeysphere.conf"}
+. "$CONF_FILE"
export GNUPGHOME
##################################################
-### FUNCTIONS
+CMD=$(basename $0)
+
+usage() {
+cat <<EOF
+usage: $CMD USERNAME
+EOF
+}
failure() {
echo "$1" >&2
### MAIN
+if [ -z "$1" ] ; then
+ usage
+ exit 1
+fi
+
+# user name of user to update
+USERNAME="$1"
+if ! id "$USERNAME" > /dev/null ; then
+ failure "User '$USERNAME' does not exist."
+fi
+
+AUTH_USER_IDS="$AUTH_USER_IDS_DIR"/"$USERNAME"
+if [ ! -e "$AUTH_USER_IDS" ] ; then
+ failure "No auth_user_ids file for user '$USERNAME'."
+fi
+
+KEYDIR="$AUTH_KEYS_DIR"/"$USERNAME"/keys
+AUTH_KEYS="$AUTH_KEYS_DIR"/authorized_keys
+
# make sure the gnupg home exists with proper permissions
mkdir -p "$GNUPGHOME"
chmod 0700 "$GNUPGHOME"
NLINES=$(meat "$AUTH_USER_IDS" | wc -l)
# clean out keys file and remake keys directory
-rm -rf "$AUTH_KEYS_DIR"/keys
-mkdir -p "$AUTH_KEYS_DIR"/keys
+rm -rf "$KEYDIR"
+mkdir -p "$KEYDIR"
# loop through all user ids, and generate ssh keys
for (( N=1; N<=$NLINES; N=N+1 )) ; do
# get user id
- USERID=$(meat "$AUTH_USER_IDS" | head --line="$N" | tail -1)
+ USERID=$(meat "$AUTH_USER_IDS" | cutline "$N" )
USERID_HASH=$(echo "$USERID" | sha1sum | awk '{ print $1 }')
- # get key id from user id
- #KEYID=$(gpguser2key "$USERID")
- KEYID="$USERID"
-
- echo "Receiving keys for: $USERID ($KEYID)..."
-
- # is primary key revoked && kill
- # for all associated keys (primary and sub)
- # - type "A"
- # - not revoked
- # - signed by trusted user
- # output ssh key
-
- # Receive keys into key ring
- if gpg --recv-keys --keyserver "$KEYSERVER" "$KEYID" ; then
- # convert pgp key to ssh key, and write to cache file
- KEYFILE="$AUTH_KEYS_DIR"/keys/"$USERID_HASH"
- gpgkey2ssh "$KEYID" | sed -e "s/COMMENT/$USERID/" > "$KEYFILE"
+ KEYFILE="$KEYDIR"/"$USERID_HASH"
+
+ # search for key on keyserver
+ echo "ms: validating: '$USERID'"
+ RETURN=$(echo 1 | gpg --quiet --batch --command-fd 0 --with-colons --keyserver "$KEYSERVER" --search ="$USERID")
+
+ # if the key was found...
+ if [ "$RETURN" ] ; then
+ echo "ms: key found."
+
+ # checking key attributes
+ # see /usr/share/doc/gnupg/DETAILS.gz:
+
+ PUB_INFO=$(gpg --fixed-list-mode --with-colons --list-keys --with-fingerprint ="$USERID" | grep '^pub:')
+
+ # extract needed fields
+ KEY_TRUST=$(echo "$PUB_INFO" | cut -d: -f2)
+ KEY_CAPABILITY=$(echo "$PUB_INFO" | cut -d: -f12)
+
+ # check if key disabled
+ if echo "$KEY_CAPABILITY" | grep -q '[D]' ; then
+ echo "ms: key disabled -> SKIPPING"
+ continue
+ fi
+
+ # check key capability
+ REQUIRED_KEY_CAPABILITY=${REQUIRED_KEY_CAPABILITY:-'a'}
+ if echo "$KEY_CAPABILITY" | grep -q '[$REQUIRED_KEY_CAPABILITY]' ; then
+ echo "ms: key capability verified ('$KEY_CAPABILITY')."
+ else
+ echo "ms: unacceptable key capability ('$KEY_CAPABILITY') -> SKIPPING"
+ continue
+ fi
+
+ echo -n "ms: key "
+
+ # if key is not fully trusted exit
+ # (this includes not revoked or expired)
+ # determine trust
+ case "$KEY_TRUST" in
+ 'i')
+ echo -n "invalid" ;;
+ 'r')
+ echo -n "revoked" ;;
+ 'e')
+ echo -n "expired" ;;
+ '-'|'q'|'n'|'m')
+ echo -n "has unacceptable trust" ;;
+ 'f'|'u')
+ echo -n "fully trusted"
+ # convert pgp key to ssh key, and write to cache file
+ echo -n " -> generating ssh key..."
+ #gpg2ssh "$KEYID" | sed -e "s/COMMENT/$USERID/" > "$KEYFILE"
+ echo " done."
+ continue
+ ;;
+ *)
+ echo -n "has unknown trust" ;;
+ esac
+ echo ". -> SKIPPING"
+ else
+ echo "ms: key not found."
fi
done
-echo "Writing authorized_keys file '$AUTH_KEYS_FILE'..."
-cat "$AUTH_KEYS_DIR"/keys/* > "$AUTH_KEYS_FILE" || > "$AUTH_KEYS_FILE"
+if [ $(ls "$KEYDIR") ] ; then
+ echo "ms: writing ms authorized_keys file..."
+ cat "$KEYDIR"/* > "$AUTH_KEYS"
+else
+ echo "ms: no gpg keys to add to authorized_keys file."
+fi
if [ -s ~"$USERNAME"/.ssh/authorized_keys ] ; then
- cat ~"$USERNAME"/.ssh/authorized_keys >> "$AUTH_KEYS_FILE"
+ echo "ms: adding user authorized_keys..."
+ cat ~"$USERNAME"/.ssh/authorized_keys >> "$AUTH_KEYS"
fi