path: root/src/share/mh/revoke_hostname

# -*-shell-script-*-
# This should be sourced by bash (though we welcome changes to make it POSIX sh compliant)

# Monkeysphere host revoke-hostname subcommand
#
# The monkeysphere scripts are written by:
# Jameson Rollins <jrollins@finestructure.net>
# Jamie McClelland <jm@mayfirst.org>
# Daniel Kahn Gillmor <dkg@fifthhorseman.net>
#
# They are Copyright 2008-2009, and are all released under the GPL,
# version 3 or later.

# revoke hostname user ID from host key

revoke_hostname() {

local userID
local fingerprint
local tmpuidMatch
local line
local uidIndex
local message
local revuidCommand

if [ -z "$1" ] ; then
    failure "You must specify a hostname to revoke."
fi

echo "WARNING: There is a known bug in this function."
echo "This function has been known to occasionally revoke the wrong user ID."
echo "Please see the following bug report for more information:"
echo "http://web.monkeysphere.info/bugs/revoke-hostname-revoking-wrong-userid/"
read -p "Are you sure you would like to proceed? (y/N) " OK; OK=${OK:=N}
if [ ${OK/y/Y} != 'Y' ] ; then
    failure "aborting."
fi

userID="ssh://${1}"

fingerprint=$(fingerprint_host_key)

# match to only ultimately trusted user IDs
tmpuidMatch="u:$(echo $userID | gpg_escape)"

# find the index of the requsted user ID
# NOTE: this is based on circumstantial evidence that the order of
# this output is the appropriate index
if line=$(gpg_host --list-keys --with-colons --fixed-list-mode "0x${fingerprint}!" \
    | egrep '^(uid|uat):' | cut -f2,10 -d: | grep -n -x -F "$tmpuidMatch") ; then
    uidIndex=${line%%:*}
else
    failure "No non-revoked user ID '$userID' is found."
fi

echo "The following host key user ID will be revoked:"
echo "  $userID"
read -p "Are you sure you would like to revoke this user ID? (y/N) " OK; OK=${OK:=N}
if [ ${OK/y/Y} != 'Y' ] ; then
    failure "User ID not revoked."
fi

message="Hostname removed by monkeysphere-server $DATE"

# edit-key script command to revoke user ID
revuidCommand=$(cat <<EOF
$uidIndex
revuid
y
4
$message

y
save
EOF
    )   

# execute edit-key script
if echo "$revuidCommand" | \
    gpg_host --quiet --command-fd 0 --edit-key "0x${fingerprint}!" ; then

    show_key

    echo
    echo "NOTE: User ID revoked, but revocation not published."
    echo "Run '$PGRM publish-key' to publish the revocation."
else
    failure "Problem revoking user ID."
fi

}