path: root/src/share/ma/setup

# -*-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 debuf "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
}