FreeBSD 13에 암호화된 스왑 파일을 추가하는 방법

Question

제공된 링크 @r bert는 가깝지만 일부 미세 조정을 통해 이점을 얻을 수 있습니다.

원작자님 감사합니다FreeBSD 포럼의 mb2015. 이 방법은 사용자 정의 서비스 스크립트를 생성하여 /etc/rc.conf.

먼저 /usr/local/etc/rc.d/encrypted_swapfile이 큰 명령을 복사하여 붙여넣고 그 뒤에 나오는 명령을 실행하여 cat생성합니다 .chmod

# cat << 'EOF' > /usr/local/etc/rc.d/encrypted_swapfile
#!/bin/sh

# PROVIDE: encrypted_swapfile
# REQUIRE: swaplate
# BEFORE: LOGIN
# KEYWORD: nojail shutdown

. /etc/rc.subr

name="encrypted_swapfile"
rcvar="encrypted_swapfile_enable"

start_cmd="${name}_start"
stop_cmd="${name}_stop"

load_rc_config "$name"
: ${encrypted_swapfile_enable:="NO"}
: ${encrypted_swapfile_file:="/usr/swap0"}
: ${encrypted_swapfile_size:="2G"}

SWFILE="$encrypted_swapfile_file";
SWFILEDIR="$(dirname "$SWFILE")";
SWDEVLINK="/var/run/encrypted_swapfile_device";

encrypted_swapfile_start()
{
    # Create and mount a one-time encrypted swap file.
    # This is a workaround for the inability to do this via an /etc/fstab entry.
    # See https://forums.freebsd.org/threads/encrypt-swap-file.44519/#post-292933
    #
    if [ ! -e "$SWDEVLINK" ]; then
        if [ -w "$SWFILEDIR" ]; then
            truncate -s "$encrypted_swapfile_size" "$encrypted_swapfile_file" &&
            chmod 0600 "$encrypted_swapfile_file" &&
            SWMD="$(mdconfig -a -t vnode -f "$encrypted_swapfile_file")" &&
            if [ $? -eq 0 ] && [ -n $SWMD ] && [ -e "/dev/$SWMD" ]; then
                chmod 0600 "/dev/$SWMD" &&
                geli onetime -e AES-XTS -l 256 -d "/dev/$SWMD" &&
                chmod 0600 "/dev/$SWMD.eli" &&
                swapon "/dev/$SWMD.eli" &&
                ln -f -s "/dev/$SWMD.eli" "$SWDEVLINK";
                unset SWMD;
            fi
        else
            echo "Could not create encrypted swap file in $SWFILEDIR; check permissions." &&
            return 1;
        fi
    else
        SWMD="$(readlink "$SWDEVLINK")" &&
        swapinfo | grep -vq "^$SWMD " &&
        echo "Encrypted swap file already exists; enabling." &&
        swapon "$SWMD";
        unset SWMD;
    fi
    return 0;
}

encrypted_swapfile_stop()
{
    if [ -e "$SWDEVLINK" ]; then
        SWMD=$(readlink "$SWDEVLINK") &&
        swapoff "$SWDEVLINK" &&
        mdconfig -du "${SWMD%.eli}" &&
        rm "$SWDEVLINK" &&
        rm "$SWFILE";
    else
        echo "No encrypted swap file found; nothing to stop.";
        rm -f "$SWDEVLINK";
    fi
}

run_rc_command "$1"

EOF
# chmod 755 /usr/local/etc/rc.d/encrypted_swapfile

그런 다음 편집하여 /etc/rc.conf이 새 서비스를 활성화하고 사용되는 변수를 구성합니다.

encrypted_swapfile_enable="yes"
encrypted_swapfile_file="/usr/swap0"
encrypted_swapfile_size="2G"

이제 서비스를 시작하거나 중지하여 암호화된 스왑 파일을 활성화하거나 비활성화할 수 있습니다 encrypted_swapfile.

# swapinfo
Device          1024-blocks     Used    Avail Capacity
# service encrypted_swapfile start
# swapinfo
Device          1024-blocks     Used    Avail Capacity
/dev/md0.eli        2097152        0  2097152     0%
# service encrypted_swapfile stop
# swapinfo
Device          1024-blocks     Used    Avail Capacity

Answer 1