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#!/bin/sh
#
# Loads IMA policy into the kernel.
ima_enabled() {
if [ "$bootparam_no_ima" = "true" ]; then
return 1
fi
}
ima_run() {
info "Initializing IMA (can be skipped with no_ima boot parameter)."
if ! grep -w securityfs /proc/mounts >/dev/null; then
if ! mount -t securityfs securityfs /sys/kernel/security; then
fatal "Could not mount securityfs."
fi
fi
if [ ! -d /sys/kernel/security/ima ]; then
fatal "No /sys/kernel/security/ima. Cannot proceed without IMA enabled in the kernel."
fi
# Instead of depending on the kernel to load the IMA X.509 certificate,
# use keyctl. This avoids a bug in certain kernels (https://lkml.org/lkml/2015/9/10/492)
# where the loaded key was not checked sufficiently. We use keyctl here because it is
# slightly smaller than evmctl and is needed anyway.
# (see http://sourceforge.net/p/linux-ima/ima-evm-utils/ci/v0.9/tree/README#l349).
for kind in ima evm; do
key=/etc/keys/x509_$kind.der
if [ -s $key ]; then
id=$(grep -w -e "\.$kind" /proc/keys | cut -d ' ' -f1 | head -n 1)
if [ "$id" ]; then
id=$(printf "%d" 0x$id)
fi
if [ -z "$id" ]; then
id=`keyctl search @u keyring _$kind 2>/dev/null`
if [ -z "$id" ]; then
id=`keyctl newring _$kind @u`
fi
fi
info "Loading $key into $kind keyring $id"
keyctl padd asymmetric "" $id <$key
fi
done
# In theory, a simple "cat" should be enough. In practice, loading sometimes fails randomly
# ("[Linux-ima-user] IMA policy loading via cat") and we get better error reporting when
# checking the write of each line. To minimize the risk of policy loading going wrong we
# also remove comments and blank lines ourselves.
if ! (set -e; while read i; do if echo "$i" | grep -q -e '^#' -e '^ *$'; then debug "Skipping IMA policy: $i"; else debug "Writing IMA policy: $i"; if echo $i; then sleep ${bootparam_ima_delay:-0}; else fatal "Invalid line in IMA policy: $i"; exit 1; fi; fi; done) </etc/ima-policy >/sys/kernel/security/ima/policy; then
fatal "Could not load IMA policy."
fi
}
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