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July 26, 2009

FreeBSD を DMZ においてみた. OpenBSD/Packet filter など

 特に意味はないのだけども,FreeBSDのマシンをDMZにおいて,外からもアクセスできるようにしてみた.
 構成は図の通り(Microsoft Visioで作成).LANには家庭のパソコンだのプリンターだのがおいてありそれらは 192.168.a.0/24の中にある.DMZは192.168.b.0/24.それぞれルーターのアドレスがあり,DNSサーバーの役割もしている.という感じ.Dmz_01
 まずはルーターの管理画面に入って設定をする.ここでは,フレッツで広く使われている,NTTのPR-200NEでその設定を見ていこう.
 2番目の図で,“高度な設定”でDMZの設定を行う.開放するポートが限定されているのならば,静的IPマスカレードでもいいのだがそれではサーバー公開の醍醐味に欠ける.ここは黙ってDMZの設定.Dmz_02
 3番目の図がその設定.例えば,LANが192.168.10.0/24,DMZを192.168.11.0/24,DMZサーバーアドレスを192.168.11.100にするのであれば,図の最初の赤丸,2番目の赤丸にチェックを入れ,3番目の赤丸に "192.168.11.100" と入力する.そののちに,仮想DMZ側 ネットワーク,“自動設定”のボタンを押すと,DMZ側のルーターのアドレスが決定される.すなわち,デフォルト・ゲートウェイである.メモしておこう.これらの変更を /etc/rc.conf や /etc/resolv.conf に施さなければならない.Dmz_03

* dyndnsとddclient
** dyndns
次は,外からアクセスするのにいちいちIPアドレスを確認してアクセスするのはダサい.ここはやはりdynamic DNSだ.DDNSのサービスをしているところはもはやさまざまだが,一応老舗っぽいDynDNS.comを選んだ.ここは,ログインして [Support] - [Tools] - Update Client Configurator といくと,ddclient の configuration file を作ってくれるのでとてもいい.まずは,アカウントとサブドメインを一つゲット.

** ddclient
インストールした覚えがないが,多分,portsからdynamic DNSのclientをインストール.

> cd /usr/ports/dns/ddclient
> sudo make install clean

ddclient は DynDNS.com でもサポートしているので心強い. config file は上に述べた sample を /usr/local/etc/ddclient.conf に流し込んでもいいのだけど,一応, /usr/local/etc/ddclient.conf.sample と見比べながら作成した.
/usr/local/etc/ddclient.conf

daemon=300                              # check every 300 seconds
syslog=yes                              # log update msgs to syslog
mail=root                               # mail all msgs to root
mail-failure=あなたのメールアドレス        # mail failed update msgs to root
pid=/var/run/ddclient.pid               # record PID in file.
ssl=yes                                 # use ssl-support.  Works with
                                        # ssl-library
## To obtain an IP address from Web status page (using the proxy if defined)
use=web, web=checkip.dyndns.org/, web-skip='IP Address' # found after IP Address
login=ログイン名                                      # default login
password=パスワード                               # default password
##
## dyndns.org dynamic addresses
##
## (supports variables: wildcard,mx,backupmx)
##
server=members.dyndns.org,              \
protocol=dyndns2                        \
(あなたの取得したdyndnsのサブドメイン名を書く)
これでいいと思う. あとは,/etc/rc.conf に
ddclient_enable="YES"
と書けば終了(たぶん).これでかっこいいサーバーが立てられる.orega-osama.dyndns.orgとかやってください.

* 証明書がないとsshできないようにする
これで,サーバーは公開されているわけだが,ssh の port が開いている.筆者のサーバーはパスワードがやや脆弱だ.少しでもリスクを減らすために,証明書を持っていない client からは ssh login できないようにしてみた.

** ssh ホスト側設定変更
まず, /etc/ssh/sshd_config

PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

# Change to yes to enable built-in password authentication.
PasswordAuthentication no
PermitEmptyPasswords no
# Change to no to disable PAM authentication
ChallengeResponseAuthentication no

** 鍵を作って置く
鍵の作成

> ssh-keygen -t dsa

dsa と rsa はどっちがいいのか正直よく分からない.
dsa だと,多分 ~/.ssh に id_dsa と id_dsa.pub というファイルが配置される.(されなければ,できた鍵ファイルを ~/.ssh にコピー)
さらに, id_dsa.pub の内容を authorized_keys に流し込む,すなわち,
> cat id_dsa.pub >> authorized_keys

これで,ホスト側の設定は(たぶん)おわり.

** Client側の設定
*** Ubuntuの場合
 結論から言えば,ホスト側の先に3つ作ったファイルを Ubuntu client の作業ホームディレクトリの ~/.ssh にコピーすればOK.公開鍵は必要ないような気がするが.何か動かなかったので全部コピーした.Ubuntu は一回 ssh ログインに成功すると次からはパスフレーズもきいてこなくなるのでちょっと不安.ノートパソコンを落とすわけにはいかなくなった.
*** Windowsの場合(PuTTY)
 秘密鍵をPuTTYの作業ディレクトリにコピーして,指定すればいいのかと思ったが,もう一段作業が必要.
id_dsa を Windows にコピーしてそれを鍵としても動かない.動かすためには puttygen.exe (PuTTY Key Generator) にロードして変換が必要なようだ.終わったら, PuTTY を起動して,[接続] - [SSH] - [認証] でプライベートキーファイルを指定する.

これで,再起動すれば,ssh のセキュリティは幾分向上する.

* Firewall (OpenBSD/Packet Filter)
とは言っても,ネットにホストを置いた以上,いわれのない攻撃や将来のことを考えておくと何らかの防御が必要.幾分考えた後,ファイアーウォールは OpenBSD/Packet filter でいくことに決定.勝因は設定ファイルのわかりやすさ.
帯域制御とかからんでくると,カーネルの再構築が必要のようだが,今回はなし.Ports collection のインストールもない.
まずは,設定ファイル.フィルターの定義はいろいろと悩んだのだが,後藤大地さんの FreeBSD ビギナーズ・バイブルの設定をほんのアレンジして使ってみた.以下は設定ファイルの内容.

/etc/pf.conf

# Macros
ext_if="fxp0"
tcp_services = "{ 21, ssh, https, http, 8180 }"
# Tables
table <priv_nets> { 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8, !192.168.0.0/23 }
table <block_ur_global_nets> { 169.253.0.0/16, 192.0.2.0/24, 244.0.0.0/4, 240.0.0.0/4 }
set block-policy drop
set loginterface $ext_if
set skip on lo
scrub in
scrub out all random-id
# Filter rules
# default block all
block log all
# full allow to local loop back
pass quick on lo0 all
# From WAN to Server settings
# block local ip
block drop in quick on $ext_if from <priv_nets> to any
# block unreachable global nets
block drop in quick on $ext_if from <block_ur_global_nets> to any
# accept all packets after connected
pass in on $ext_if inet proto tcp from any to $ext_if flags A/A
# accept dns
pass in on $ext_if inet proto udp from any to $ext_if port domain
pass in on $ext_if inet proto tcp from any to $ext_if port domain flags S/SA
# accept dns request result
pass in on $ext_if inet proto udp from any port domain to $ext_if
# accept ntp request result
pass in on $ext_if inet proto udp from any port ntp to $ext_if
# accept tcp services
pass in on $ext_if inet proto tcp from any to $ext_if port $tcp_services flags S/SA
# pass icmp
pass in on $ext_if inet proto icmp all icmp-type { 0, 3 }
# From Server to WAN settings
# block local ip
block drop out quick on $ext_if from any to <priv_nets>
# block unreachable global nets
block drop out quick on $ext_if from any to <block_ur_global_nets>
# accept all packets after connected
pass out on $ext_if inet proto tcp from $ext_if to any flags A/A
# accept all packets to connect
pass out on $ext_if inet proto tcp from $ext_if to any flags S/SA
# accept dns
pass out on $ext_if inet proto udp from $ext_if to any port domain
# accept dns request result
pass out on $ext_if inet proto udp from $ext_if port domain to any
# accept ntp
pass out on $ext_if inet proto udp from $ext_if port ntp to any
# accept ping
pass out on $ext_if inet proto icmp all icmp-type 8
ネットワークアドレス範囲はちょっと凝った記述をしようとするなら,テーブルを使う方が賢明なようだ.例えば,192.168.10.0/24の192.168.10.10だけをパスするという場合,
pass .... from { 192.168.10.0/24, !192.168.10.10 } to ....
というのはいけないらしい(OpenBSD/Packet Filterのページより). 今回少し苦労したのはこのファイルのテーブル <priv_nets> である.すなわち,ルーター用途のようなマシンではプライベートアドレスからのアクセスは IP を騙っているので捨てなさい,ということなのだが,本例の場合,マシンは 192.168.0.0/24 のアドレスにあって dns の問い合わせはルーターに飛んで結果もルーターから戻ってくる.したがって, 192.168.0.0/24 から/へのパケットは破棄できない.また,家庭内の LAN のアドレスも 192.168.1.0/24 なのでこれらのパケットは通してやる必要がある.これらの結果, !192.168.0.0/23 という苦肉の記述が入っている.(冒頭でせっかく伏せ字にしたのに晒してしまった...) 設定ファイルを作ったところで再起動する前に設定ファイルを確認しよう.Packet Filter は起動時に設定ファイルがおかしくても:特にフィルター・ルールが間違っているだけの場合,特に何も教えてくれない.確認するためには pfctl コマンドを用いて.
# pfctl -f /etc/pf.conf     Load the pf.conf file
# pfctl -nf /etc/pf.conf    Parse the file, but don't load it
# pfctl -Nf /etc/pf.conf    Load only the NAT rules from the file
# pfctl -Rf /etc/pf.conf    Load only the filter rules from the file
# pfctl -sn                 Show the current NAT rules 
# pfctl -sr                 Show the current filter rules
# pfctl -ss                 Show the current state table
# pfctl -si                 Show filter stats and counters
# pfctl -sa                 Show EVERYTHING it can show
とあるので,
# pfctl -f /etc/pf.conf
として
# pfctl -sr
で,フィルタールールがあっているか確認する.と,いうようにできる.特に, pfctl -f ... でおかしければ教えてくれる. あとは,起動時に自動で立ち上がるように, /etc/rc.conf に以下を追記することだけだ.
pf_enable="YES"                  # Set to YES to enable packet filter (pf)
pf_rules="/etc/pf.conf"         # rules definition file for pf
pf_program="/sbin/pfctl"        # where the pfctl program lives
pf_flags=""                     # additional flags for pfctl
pflog_enable="YES"               # Set to YES to enable packet filter logging
pflog_logfile="/var/log/pflog"  # where pflogd should store the logfile
pflog_program="/sbin/pflogd"    # where the pflogd program lives
pflog_flags=""                  # additional flags for pflogd
ログは以下のコマンドで(設定してあれば)見ることができる.上記の例だとドロップされたパケットの記録が残っているはずだ.
# tcpdump -n -e -ttt -r /var/log/pflog
なんか,pf のフィルタールールはもっとシンプルになりそうなものだけどどうなのだろう.どなたかエロい人御教授頼む.

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