# -*-shell-script-*- # This should be sourced by bash (though we welcome changes to make it POSIX sh compliant) # Monkeysphere authentication setup 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 2009, and are all released under the GPL, # version 3 or later. setup() { # make all needed directories mkdir -p "${MADATADIR}" mkdir -p "${MATMPDIR}" mkdir -p "${GNUPGHOME_CORE}" chmod 700 "${GNUPGHOME_CORE}" mkdir -p "${GNUPGHOME_SPHERE}" chmod 700 "${GNUPGHOME_SPHERE}" mkdir -p "${MADATADIR}"/authorized_keys # deliberately replace the config files via truncation # FIXME: should we be dumping to tmp files and then moving atomically? cat >"${GNUPGHOME_CORE}"/gpg.conf <<EOF # Monkeysphere trust core GnuPG configuration # This file is maintained by the Monkeysphere software. # Edits will be overwritten. no-greeting list-options show-uid-validity EOF cat >"${GNUPGHOME_SPHERE}"/gpg.conf <<EOF # Monkeysphere trust sphere GnuPG configuration # This file is maintained by the Monkeysphere software. # Edits will be overwritten. no-greeting primary-keyring ${GNUPGHOME_SPHERE}/pubring.gpg list-options show-uid-validity EOF # make sure the monkeysphere user owns everything in th sphere # gnupghome chown -R "$MONKEYPSHER_USER" "${GNUPGHOME_SPHERE}" chgrp -R "$MONKEYPSHER_USER" "${GNUPGHOME_SPHERE}" # get fingerprint of core key. this should be empty on unconfigured systems. local CORE_FPR=$(gpg_core --with-colons --fixed-list-mode --fingerprint --list-secret-key | grep ^fpr: | cut -f10 -d: ) if [ -z "$CORE_FPR" ] ; then log info "Setting up Monkeysphere authentication trust core..." local CORE_UID=$(printf "Monkeysphere authentication trust core UID (random string: %s)" $(head -c21 </dev/urandom | base64)) local TMPLOC=$(mktemp -d "${MATMPDIR}"/tmp.XXXXXXXXXX) || failure "Could not create temporary directory!" # generate the key with ssh-keygen... log debug "generating ssh key ($CORE_KEYLENGTH bits)..." ssh-keygen -q -b "$CORE_KEYLENGTH" -t rsa -N '' -f "${TMPLOC}/authkey" || failure "Could not generate new key for Monkeysphere authentication trust core" # and then translate to openpgp encoding and import # FIXME: pem2openpgp currently sets the A flag and a short # expiration date. We should set the C flag and no expiration # date. log debug "converting ssh key to openpgp key and importing into core..." < "${TMPLOC}/authkey" pem2openpgp "$CORE_UID" | gpg_core --import || failure "Could not import new key for Monkeysphere authentication trust core" # get fingerprint of core key. should definitely not be empty at this point log debug "get core key fingerprint..." CORE_FPR=$(gpg_core --with-colons --fixed-list-mode --fingerprint --list-secret-key | grep ^fpr: | cut -f10 -d: ) if [ -z "$CORE_FPR" ] ; then failure "Failed to create Monkeysphere authentication trust core!" fi else log verbose "This system has already set up the Monkeysphere authentication trust core." fi # ensure that the authentication sphere checker has absolute ownertrust on the expected key. log debug "set ultimate owner trust on core key in gpg_sphere..." printf "%s:6:\n" "$CORE_FPR" | gpg_sphere --import-ownertrust local ORIG_TRUST log debug "check gpg_sphere owner trust set properly..." if ORIG_TRUST=$(gpg_sphere --export-ownertrust | grep '^[^#]') ; then if [ "${CORE_FPR}:6:" != "$ORIG_TRUST" ] ; then failure "Monkeysphere authentication trust sphere should explicitly trust the core. It does not have proper ownertrust settings." fi else failure "Could not get monkeysphere-authentication trust guidelines." fi # ensure that we're using the extended trust model (1), and that # our preferences are reasonable (i.e. 3 marginal OR 1 fully # trusted certifications are sufficient to grant full validity. log debug "check trust level of core key..." if [ "1:3:1" != $(gpg_sphere --with-colons --fixed-list-mode --list-keys | head -n1 | grep ^tru: cut -f3,6,7 -d:) ] ; then failure "monkeysphere-authentication does not have the expected trust model settings." fi }