# -*-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 "${MADATADIR}"/authorized_keys # deliberately replace the config files via truncation # FIXME: should we be dumping to tmp files and then moving atomically? log debug "write core gpg.conf..." cat >"${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 log debug "write sphere gpg.conf..." 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 ${GNUPGHOME_SPHERE}/pubring.gpg list-options show-uid-validity EOF # make sure the monkeysphere user owns everything in the sphere # gnupghome log debug "fix sphere gnupg home ownership..." chown -R "$MONKEYSPHERE_USER" "${GNUPGHOME_SPHERE}" chgrp -R "$MONKEYSPHERE_USER" "${GNUPGHOME_SPHERE}" # get fingerprint of core key. this should be empty on unconfigured systems. local CORE_FPR=$(core_fingerprint) log debug "core fingerprint: $CORE_FPR" if [ -z "$CORE_FPR" ] ; then log info "setting up Monkeysphere authentication trust core..." local CORE_UID=$(printf "Monkeysphere authentication trust core UID (random string: %s)" $(head -c21 </dev/urandom | base64)) log debug "generating monkeysphere authentication trust core key ($CORE_KEYLENGTH bits)..." PEM2OPENPGP_USAGE_FLAGS=certify \ PEM2OPENPGP_NEWKEY=$CORE_KEYLENGTH pem2openpgp "$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 CORE_FPR=$(core_fingerprint) log debug "core fingerprint: $CORE_FPR" if [ -z "$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 # export the core key to the sphere keyring log debug "export core pub key to sphere keyring..." gpg_core --export | gpg_sphere --import # 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" "$CORE_FPR" | gpg_sphere --import-ownertrust gpg_sphere --export-ownertrust | log debug # check the owner trust log debug "check gpg_sphere owner trust set properly..." local ORIG_TRUST if ORIG_TRUST=$(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 "checking trust level of core key..." local TRUST_LEVEL=$(gpg_sphere --with-colons --fixed-list-mode --list-keys \ | head -n1 | grep "^tru:" | cut -d: -f3,6,7) log debug "sphere trust level of core: $TRUST_LEVEL" if [ "$TRUST_LEVEL" != '1:3:1' ] ; then failure "monkeysphere-authentication does not have the expected trust model settings." fi }