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#!/usr/bin/sh
SECURITYFSDIR="/sys/kernel/security"
IMASECDIR="${SECURITYFSDIR}/ima"
IMACONFIG="${NEWROOT}/etc/sysconfig/ima"
load_x509_keys() {
KEYRING_ID=$1
# override the default configuration
if [ -f "${IMACONFIG}" ]; then
# shellcheck disable=SC1090
. "${IMACONFIG}"
fi
if [ -z "${IMAKEYSDIR}" ]; then
IMAKEYSDIR="/etc/keys/ima"
fi
for PUBKEY in "${NEWROOT}${IMAKEYSDIR}"/*; do
# check for public key's existence
if [ ! -f "${PUBKEY}" ]; then
if [ "${RD_DEBUG}" = "yes" ]; then
info "integrity: IMA x509 cert file not found: ${PUBKEY}"
fi
continue
fi
# FIXME: X509ID unused?
# shellcheck disable=SC2034
if ! X509ID=$(evmctl import "${PUBKEY}" "${KEYRING_ID}"); then
info "integrity: IMA x509 cert not loaded on keyring: ${PUBKEY}"
fi
done
if [ "${RD_DEBUG}" = "yes" ]; then
keyctl show "${KEYRING_ID}"
fi
return 0
}
# check kernel support for IMA
if [ ! -e "${IMASECDIR}" ]; then
if [ "${RD_DEBUG}" = "yes" ]; then
info "integrity: IMA kernel support is disabled"
fi
return 0
fi
# get the IMA keyring id
if line=$(keyctl describe %keyring:.ima); then
_ima_id=${line%%:*}
else
_ima_id=$(keyctl search @u keyring _ima)
if [ -z "${_ima_id}" ]; then
_ima_id=$(keyctl newring _ima @u)
fi
fi
# load the IMA public key(s)
load_x509_keys "${_ima_id}"