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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Kselftest framework defines: ksft_pass=0, ksft_fail=1, ksft_skip=4
VERBOSE="${VERBOSE:-1}"
IKCONFIG="/tmp/config-`uname -r`"
KERNEL_IMAGE="/boot/vmlinuz-`uname -r`"
SECURITYFS=$(grep "securityfs" /proc/mounts | awk '{print $2}')
log_info()
{
[ $VERBOSE -ne 0 ] && echo "[INFO] $1"
}
# The ksefltest framework requirement returns 0 for PASS.
log_pass()
{
[ $VERBOSE -ne 0 ] && echo "$1 [PASS]"
exit 0
}
# The ksefltest framework requirement returns 1 for FAIL.
log_fail()
{
[ $VERBOSE -ne 0 ] && echo "$1 [FAIL]"
exit 1
}
# The ksefltest framework requirement returns 4 for SKIP.
log_skip()
{
[ $VERBOSE -ne 0 ] && echo "$1"
exit 4
}
# Check efivar SecureBoot-$(the UUID) and SetupMode-$(the UUID).
# (Based on kdump-lib.sh)
get_efivarfs_secureboot_mode()
{
local efivarfs="/sys/firmware/efi/efivars"
local secure_boot_file=""
local setup_mode_file=""
local secureboot_mode=0
local setup_mode=0
# Make sure that efivar_fs is mounted in the normal location
if ! grep -q "^\S\+ $efivarfs efivarfs" /proc/mounts; then
log_info "efivars is not mounted on $efivarfs"
return 0;
fi
secure_boot_file=$(find "$efivarfs" -name SecureBoot-* 2>/dev/null)
setup_mode_file=$(find "$efivarfs" -name SetupMode-* 2>/dev/null)
if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then
secureboot_mode=$(hexdump -v -e '/1 "%d\ "' \
"$secure_boot_file"|cut -d' ' -f 5)
setup_mode=$(hexdump -v -e '/1 "%d\ "' \
"$setup_mode_file"|cut -d' ' -f 5)
if [ $secureboot_mode -eq 1 ] && [ $setup_mode -eq 0 ]; then
log_info "secure boot mode enabled (CONFIG_EFIVAR_FS)"
return 1;
fi
fi
return 0;
}
get_efi_var_secureboot_mode()
{
local efi_vars
local secure_boot_file
local setup_mode_file
local secureboot_mode
local setup_mode
if [ ! -d "$efi_vars" ]; then
log_skip "efi_vars is not enabled\n"
fi
secure_boot_file=$(find "$efi_vars" -name SecureBoot-* 2>/dev/null)
setup_mode_file=$(find "$efi_vars" -name SetupMode-* 2>/dev/null)
if [ -f "$secure_boot_file/data" ] && \
[ -f "$setup_mode_file/data" ]; then
secureboot_mode=`od -An -t u1 "$secure_boot_file/data"`
setup_mode=`od -An -t u1 "$setup_mode_file/data"`
if [ $secureboot_mode -eq 1 ] && [ $setup_mode -eq 0 ]; then
log_info "secure boot mode enabled (CONFIG_EFI_VARS)"
return 1;
fi
fi
return 0;
}
# Check efivar SecureBoot-$(the UUID) and SetupMode-$(the UUID).
# The secure boot mode can be accessed either as the last integer
# of "od -An -t u1 /sys/firmware/efi/efivars/SecureBoot-*" or from
# "od -An -t u1 /sys/firmware/efi/vars/SecureBoot-*/data". The efi
# SetupMode can be similarly accessed.
# Return 1 for SecureBoot mode enabled and SetupMode mode disabled.
get_secureboot_mode()
{
local secureboot_mode=0
get_efivarfs_secureboot_mode
secureboot_mode=$?
# fallback to using the efi_var files
if [ $secureboot_mode -eq 0 ]; then
get_efi_var_secureboot_mode
secureboot_mode=$?
fi
if [ $secureboot_mode -eq 0 ]; then
log_info "secure boot mode not enabled"
fi
return $secureboot_mode;
}
require_root_privileges()
{
if [ $(id -ru) -ne 0 ]; then
log_skip "requires root privileges"
fi
}
# Look for config option in Kconfig file.
# Return 1 for found and 0 for not found.
kconfig_enabled()
{
local config="$1"
local msg="$2"
grep -E -q $config $IKCONFIG
if [ $? -eq 0 ]; then
log_info "$msg"
return 1
fi
return 0
}
# Attempt to get the kernel config first via proc, and then by
# extracting it from the kernel image or the configs.ko using
# scripts/extract-ikconfig.
# Return 1 for found.
get_kconfig()
{
local proc_config="/proc/config.gz"
local module_dir="/lib/modules/`uname -r`"
local configs_module="$module_dir/kernel/kernel/configs.ko"
if [ ! -f $proc_config ]; then
modprobe configs > /dev/null 2>&1
fi
if [ -f $proc_config ]; then
cat $proc_config | gunzip > $IKCONFIG 2>/dev/null
if [ $? -eq 0 ]; then
return 1
fi
fi
local extract_ikconfig="$module_dir/source/scripts/extract-ikconfig"
if [ ! -f $extract_ikconfig ]; then
log_skip "extract-ikconfig not found"
fi
$extract_ikconfig $KERNEL_IMAGE > $IKCONFIG 2>/dev/null
if [ $? -eq 1 ]; then
if [ ! -f $configs_module ]; then
log_skip "CONFIG_IKCONFIG not enabled"
fi
$extract_ikconfig $configs_module > $IKCONFIG
if [ $? -eq 1 ]; then
log_skip "CONFIG_IKCONFIG not enabled"
fi
fi
return 1
}
# Make sure that securityfs is mounted
mount_securityfs()
{
if [ -z $SECURITYFS ]; then
SECURITYFS=/sys/kernel/security
mount -t securityfs security $SECURITYFS
fi
if [ ! -d "$SECURITYFS" ]; then
log_fail "$SECURITYFS :securityfs is not mounted"
fi
}
# The policy rule format is an "action" followed by key-value pairs. This
# function supports up to two key-value pairs, in any order.
# For example: action func=<keyword> [appraise_type=<type>]
# Return 1 for found and 0 for not found.
check_ima_policy()
{
local action="$1"
local keypair1="$2"
local keypair2="$3"
local ret=0
mount_securityfs
local ima_policy=$SECURITYFS/ima/policy
if [ ! -e $ima_policy ]; then
log_fail "$ima_policy not found"
fi
if [ -n $keypair2 ]; then
grep -e "^$action.*$keypair1" "$ima_policy" | \
grep -q -e "$keypair2"
else
grep -q -e "^$action.*$keypair1" "$ima_policy"
fi
# invert "grep -q" result, returning 1 for found.
[ $? -eq 0 ] && ret=1
return $ret
}
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