[ SEA-GHOST MINI SHELL]

#!/bin/sh

#set -vx

LCFILE=/etc/pki/ca-trust/ca-legacy.conf
LLINK=/etc/pki/ca-trust/source/ca-bundle.legacy.crt
LDEFAULT=/usr/share/pki/ca-trust-legacy/ca-bundle.legacy.default.crt
LDISABLE=/usr/share/pki/ca-trust-legacy/ca-bundle.legacy.disable.crt

# An absent value, or any unexpected value, is treated as "default".
is_disabled()
{
    grep -i "^legacy *= *disable *$" $LCFILE >/dev/null 2>&1
}

do_check()
{
    is_disabled
    if [ $? -eq 0 ]; then
        echo "Legacy CAs are set to DISABLED in file $LCFILE (affects install/upgrade)"
        LEXPECT=$LDISABLE
    else
        echo "Legacy CAs are set to DEFAULT in file $LCFILE (affects install/upgrade)"
        LEXPECT=$LDEFAULT
    fi
    echo "Status of symbolic link $LLINK:"
    readlink -v $LLINK
}

do_install()
{
    is_disabled
    if [ $? -eq 0 ]; then
        # found, legacy is disabled
        sln $LDISABLE $LLINK
    else
        # expression not found, legacy is set to default
        sln $LDEFAULT $LLINK
    fi
}

do_default()
{
    sed -i 's/^legacy *=.*$/legacy=default/' $LCFILE
    do_install
    /usr/bin/update-ca-trust
}

do_disable()
{
    sed -i 's/^legacy *=.*$/legacy=disable/' $LCFILE
    do_install
    /usr/bin/update-ca-trust
}

do_help()
{
    echo "usage: $0 [check | default | disable | install]"
}

if [[ $# -eq 0 ]]; then
  # no parameters
  do_help
  exit $?
fi

if [[ "$1" = "install" ]]; then
  do_install
  exit $?
fi

if [[ "$1" = "default" ]]; then
  do_default
  exit $?
fi
if [[ "$1" = "disable" ]]; then
  do_disable
  exit $?
fi

if [[ "$1" = "check" ]]; then
  do_check
  exit $?
fi

echo "$0: Unsupported command $1"
do_help