{"id":106493,"date":"2023-01-26T00:48:10","date_gmt":"2023-01-25T22:48:10","guid":{"rendered":"https:\/\/prohoster.info\/?p=106493"},"modified":"2023-01-26T10:23:05","modified_gmt":"2023-01-26T08:23:05","slug":"dostupen-openvpn-2-6-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/dostupen-openvpn-2-6-0","title":{"rendered":"El\u00e9rhet\u0151 az OpenVPN 2.6.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>K\u00e9t \u00e9s f\u00e9l \u00e9vvel a 2.5-\u00f6s \u00e1gazat kiad\u00e1sa ut\u00e1n elk\u00e9sz\u00fclt az OpenVPN 2.6.0 kiad\u00e1sa, amely egy virtu\u00e1lis mag\u00e1nh\u00e1l\u00f3zatok l\u00e9trehoz\u00e1s\u00e1ra szolg\u00e1l\u00f3 csomag. Ez lehet\u0151v\u00e9 teszi egy titkos\u00edtott kapcsolat l\u00e9trehoz\u00e1s\u00e1t k\u00e9t kliensg\u00e9p k\u00f6z\u00f6tt, vagy egy k\u00f6zpontos\u00edtott VPN-szerver m\u0171k\u00f6dtet\u00e9s\u00e9t, amely egyszerre t\u00f6bb kliens sz\u00e1m\u00e1ra biztos\u00edt szolg\u00e1ltat\u00e1st. Az OpenVPN k\u00f3dja GPLv2 licenc alatt terjesztett, a k\u00e9sz bin\u00e1ris csomagok Debian, Ubuntu, CentOS, RHEL \u00e9s Windows rendszerekre k\u00e9sz\u00fclnek.      <\/p>\n<p>F\u0151bb \u00faj\u00edt\u00e1sok:  <\/p>\n<ul>\n<li class=\"l\"> T\u00e1mogatott a korl\u00e1tlan sz\u00e1m\u00fa kapcsolat biztos\u00edt\u00e1sa.\n<li class=\"l\"> Be\u00e9p\u00edt\u00e9sre ker\u00fclt az ovpn-dco kernelfel\u00fclet, amely jelent\u0151sen felgyors\u00edtja a teljes\u00edtm\u00e9nyt. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"235\">VPN<\/a>A sebess\u00e9gn\u00f6veked\u00e9s azt eredm\u00e9nyezi, hogy minden titkos\u00edt\u00e1si, csomagfeldolgoz\u00e1si \u00e9s kapcsolati vez\u00e9rl\u00e9si m\u0171velet a Linux kernel oldal\u00e1ra ker\u00fclt, \u00edgy cs\u00f6kkenthet\u0151 a kontextusv\u00e1lt\u00e1ssal j\u00e1r\u00f3 k\u00f6lts\u00e9g, lehet\u0151v\u00e9 t\u00e9ve a munkafolyamatok optimaliz\u00e1l\u00e1s\u00e1t k\u00f6zvetlen\u00fcl a kernel bels\u0151 API-jaihoz val\u00f3 hozz\u00e1f\u00e9r\u00e9ssel, \u00e9s megsz\u00fcntetve a lass\u00fa adat\u00e1tvitelt a kernel \u00e9s a felhaszn\u00e1l\u00f3i t\u00e9r k\u00f6z\u00f6tt (a titkos\u00edt\u00e1st, dek\u00f3dol\u00e1st \u00e9s \u00fatv\u00e1laszt\u00e1st a modul v\u00e9gzi an\u00e9lk\u00fcl, hogy a forgalmat a felhaszn\u00e1l\u00f3i t\u00e9rbeli feldolgoz\u00f3ba k\u00fclden\u00e9).\n<p>A v\u00e9gzett tesztek sor\u00e1n a tun interf\u00e9sz alap\u00fa konfigur\u00e1ci\u00f3hoz k\u00e9pest a modul \u00fcgyf\u00e9l \u00e9s szerver oldal\u00e1n t\u00f6rt\u00e9n\u0151 haszn\u00e1lata AES-256-GCM titkos\u00edt\u00e1ssal nyolcszoros, 370 Mbit\/s-r\u00f3l 2950 Mbit\/s-ra t\u00f6rt\u00e9n\u0151 s\u00e1vsz\u00e9less\u00e9gn\u00f6vel\u00e9st eredm\u00e9nyezett. Ha a modult csak az \u00fcgyf\u00e9ln\u00e9l alkalmazt\u00e1k, a s\u00e1vsz\u00e9less\u00e9g h\u00e1romszoros\u00e1ra n\u0151tt a kimen\u0151 forgalomban, \u00e9s a bej\u00f6v\u0151 forgalomban nem v\u00e1ltozott. A modul szerver oldali alkalmaz\u00e1s\u00e1val a s\u00e1vsz\u00e9less\u00e9g n\u00e9gyszeres\u00e9re n\u0151tt a bej\u00f6v\u0151 forgalomban, \u00e9s 35%-kal a kimen\u0151 forgalomban.      <\/p>\n<li class=\"l\"> Lehet\u0151s\u00e9get biztos\u00edtottunk a TLS \u00fczemm\u00f3dban haszn\u00e1lt \u00f6nal\u00e1\u00edrt tan\u00fas\u00edtv\u00e1nyok alkalmaz\u00e1s\u00e1ra (a &#171;&#8212;peer-fingerprint&#187; opci\u00f3 haszn\u00e1lata eset\u00e9n nincs sz\u00fcks\u00e9g az &#171;&#8212;ca&#187; \u00e9s &#171;&#8212;capath&#187; param\u00e9terek megad\u00e1s\u00e1ra, \u00edgy nem sz\u00fcks\u00e9ges az Easy-RSA vagy hasonl\u00f3 szoftver alap\u00fa PKI-szerver ind\u00edt\u00e1sa sem).\n<li class=\"l\"> Az UDP-szerverben megval\u00f3s\u00edtva a Cookie-alap\u00fa kapcsol\u00f3d\u00e1si k\u00e9pes\u00edt\u00e9si m\u00f3d, amelyben a munkamenet azonos\u00edt\u00f3 Cookie nagy teljes\u00edtm\u00e9ny\u0171 HMAC-b\u00f3l \u00e1ll, lehet\u0151v\u00e9 t\u00e9ve a szerver sz\u00e1m\u00e1ra a verifik\u00e1ci\u00f3t \u00e1llapot ment\u00e9se n\u00e9lk\u00fcl.\n<li class=\"l\"> Hozz\u00e1adtuk az OpenSSL 3.0 k\u00f6nyvt\u00e1rral val\u00f3 ford\u00edt\u00e1s t\u00e1mogat\u00e1s\u00e1t. Bevezet\u00e9sre ker\u00fclt az &#171;&#8212;tls-cert-profile insecure&#187; param\u00e9ter, amely lehet\u0151v\u00e9 teszi az OpenSSL minim\u00e1lis biztons\u00e1gi szintj\u00e9nek kiv\u00e1laszt\u00e1s\u00e1t.\n<li class=\"l\"> \u00daj t\u00e1voli parancsok, a remote-entry-count \u00e9s a remote-entry-get ker\u00fcltek bevezet\u00e9sre, amelyek a k\u00fcls\u0151 kapcsolatok sz\u00e1m\u00e1ra sz\u00e1mol\u00e1s\u00e1ra \u00e9s list\u00e1juk megjelen\u00edt\u00e9s\u00e9re szolg\u00e1lnak.\n<li class=\"l\"> A kulcsok \u00f6sszehangol\u00e1sakor a gener\u00e1l\u00e1s anyag\u00e1nak megszerz\u00e9s\u00e9re mostant\u00f3l a priorit\u00e1st \u00e9lvez\u0151 m\u00f3dszer az EKM (Exported Keying Material, RFC 5705) mechanizmus, ahelyett, hogy az OpenVPN PRF specifikus mechanizmus\u00e1t haszn\u00e1ln\u00e1k. Az EKM alkalmaz\u00e1s\u00e1hoz OpenSSL vagy mbed TLS 2.18+ k\u00f6nyvt\u00e1r sz\u00fcks\u00e9ges.\n<li class=\"l\"> Biztos\u00edtott a kompatibilit\u00e1s az OpenSSL FIPS \u00fczemm\u00f3dban, lehet\u0151v\u00e9 t\u00e9ve az OpenVPN haszn\u00e1lat\u00e1t olyan rendszereken, amelyek megfelelnek a FIPS 140-2 biztons\u00e1gi k\u00f6vetelm\u00e9nyeinek.\n<li class=\"l\"> Az mlock megval\u00f3s\u00edtotta a megfelel\u0151 m\u00e9ret\u0171 mem\u00f3ria lefoglal\u00e1s\u00e1nak ellen\u0151rz\u00e9s\u00e9t. Ha a rendelkez\u00e9sre \u00e1ll\u00f3 mem\u00f3ria kevesebb mint 100 MB, a korl\u00e1t n\u00f6vel\u00e9se \u00e9rdek\u00e9ben a setrlimit() h\u00edv\u00e1sa t\u00f6rt\u00e9nik.\n<li class=\"l\"> Bevezet\u00e9sre ker\u00fclt az &#171;&#8212;peer-fingerprint&#187; opci\u00f3 a tan\u00fas\u00edtv\u00e1ny helyess\u00e9g\u00e9nek vagy azonos\u00edt\u00e1s\u00e1nak ellen\u0151rz\u00e9s\u00e9re SHA256 alap\u00fa ujjlenyomat alapj\u00e1n, tls-verify alkalmaz\u00e1sa n\u00e9lk\u00fcl.\n<li class=\"l\"> A szkriptek sz\u00e1m\u00e1ra lehet\u0151s\u00e9get biztos\u00edtottunk a k\u00e9sleltetett (deferred) hiteles\u00edt\u00e9sre, amely megval\u00f3s\u00edthat\u00f3 az &#171;&#8212;auth-user-pass-verify&#187; opci\u00f3 r\u00e9v\u00e9n. A szkriptekben \u00e9s b\u0151v\u00edtm\u00e9nyekben hozz\u00e1adtuk a kliens \u00e9rtes\u00edt\u00e9s\u00e9nek t\u00e1mogat\u00e1s\u00e1t a k\u00e9sleltetett hiteles\u00edt\u00e9s v\u00e1rakoz\u00e1si \u00e1llapot\u00e1r\u00f3l.\n<li class=\"l\"> Hozz\u00e1adtunk egy kompatibilit\u00e1si m\u00f3dot (&#8212;compat-mode), amely lehet\u0151v\u00e9 teszi a csatlakoz\u00e1st a r\u00e9gi OpenVPN 2.3.x vagy ann\u00e1l r\u00e9gebbi verzi\u00f3kat futtat\u00f3 szerverekhez.\n<li class=\"l\"> A &#171;&#8212;data-ciphers&#187; param\u00e9teren kereszt\u00fcl \u00e1tadott list\u00e1ban megengedett a &#171;?&#187; prefix megad\u00e1sa, amely opcion\u00e1lis titkos\u00edt\u00e1sokat hat\u00e1roz meg, amelyek csak t\u00e1mogat\u00e1s eset\u00e9n lesznek akt\u00edvak. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/ssl-sertifikat\/\"   title=\"SSL\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2316\">SSL<\/a>-k\u00f6nyvt\u00e1rban t\u00e1mogatottak, \u00e9rv\u00e9nyes\u00fclnek.\n<li class=\"l\"> Bevezet\u00e9sre ker\u00fclt az &#171;&#8212;session-timeout&#187; opci\u00f3, amely lehet\u0151v\u00e9 teszi a maxim\u00e1lis munkamenet id\u0151 korl\u00e1toz\u00e1s\u00e1t.\n<li class=\"l\"> A konfigur\u00e1ci\u00f3s f\u00e1jlban megengedett a n\u00e9v \u00e9s jelsz\u00f3 megad\u00e1sa a &lt;auth-user-pass&gt;&lt;\/auth-user-pass&gt; tag seg\u00edts\u00e9g\u00e9vel.\n<li class=\"l\"> Lehet\u0151s\u00e9get biztos\u00edtunk a kliens MTU dinamikus be\u00e1ll\u00edt\u00e1s\u00e1ra a szerver \u00e1ltal \u00e1tadott MTU adatok alapj\u00e1n. Az MTU maxim\u00e1lis m\u00e9ret\u00e9nek megv\u00e1ltoztat\u00e1s\u00e1ra bevezet\u00e9sre ker\u00fclt az &#171;&#8212;tun-mtu-max&#187; opci\u00f3 (alap\u00e9rtelmez\u00e9s szerint 1600).\n<li class=\"l\"> Hozz\u00e1adtuk az &#171;&#8212;max-packet-size&#187; param\u00e9tert a vez\u00e9rl\u0151csomagok maxim\u00e1lis m\u00e9ret\u00e9nek meghat\u00e1roz\u00e1s\u00e1ra.\n<li class=\"l\"> Elt\u00e1vol\u00edtottuk az OpenVPN ind\u00edt\u00e1s\u00e1nak inetd m\u00f3dban val\u00f3 t\u00e1mogat\u00e1s\u00e1t. Elt\u00e1vol\u00edt\u00e1sra ker\u00fclt az ncp-disable opci\u00f3. Elavultnak nyilv\u00e1n\u00edtottuk a verify-hash opci\u00f3t \u00e9s a statikus kulcsok \u00fczemm\u00f3dj\u00e1t (csak a TLS maradt). Elavult t\u00e1rcs\u00e1z\u00e1s\u00fav\u00e1 v\u00e1lt a TLS 1.0-\u00e1s \u00e9s 1.1-es protokoll (a tls-version-min param\u00e9ter alap\u00e9rtelmezetten 1.2-re van be\u00e1ll\u00edtva). Elt\u00e1vol\u00edtottuk a be\u00e9p\u00edtett \u00e1lnyom\u00e1s-gener\u00e1tor megval\u00f3s\u00edt\u00e1st (&#8212;prng), helyette az mbed TLS vagy OpenSSL kriptogr\u00e1fiai k\u00f6nyvt\u00e1rakb\u00f3l sz\u00e1rmaz\u00f3 PRNG megval\u00f3s\u00edt\u00e1st aj\u00e1nlott haszn\u00e1lni. Megsz\u00fcntett\u00fck a PF (Packet Filtering) csomagsz\u0171r\u0151 t\u00e1mogat\u00e1s\u00e1t. Az alap\u00e9rtelmezett be\u00e1ll\u00edt\u00e1sban a t\u00f6m\u00f6r\u00edt\u00e9s le van tiltva (&#8212;allow-compression=no).\n<li class=\"l\"> A CHACHA20-POLY1305 titkos\u00edt\u00e1s hozz\u00e1 lett adva az alap\u00e9rtelmezett titkos\u00edt\u00f3k list\u00e1j\u00e1hoz.    <\/ul>\n<\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58549\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0434\u0432\u0443\u0445 \u0441 \u043f\u043e\u043b\u043e\u0432\u0438\u043d\u043e\u0439 \u043b\u0435\u0442 \u0441 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0432\u0435\u0442\u043a\u0438 2.5 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenVPN 2.6.0, \u043f\u0430\u043a\u0435\u0442\u0430 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u0447\u0430\u0441\u0442\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043c\u0435\u0436\u0434\u0443 \u0434\u0432\u0443\u043c\u044f \u043a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u0438\u043c\u0438 \u043c\u0430\u0448\u0438\u043d\u0430\u043c\u0438 \u0438\u043b\u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u0443 \u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e VPN-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u0440\u0430\u0431\u043e\u0442\u044b \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u0432. \u041a\u043e\u0434 OpenVPN \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv2, \u0433\u043e\u0442\u043e\u0432\u044b\u0435 \u0431\u0438\u043d\u0430\u0440\u043d\u044b\u0435 \u043f\u0430\u043a\u0435\u0442\u044b \u0444\u043e\u0440\u043c\u0438\u0440\u0443\u044e\u0442\u0441\u044f \u0434\u043b\u044f Debian, Ubuntu, CentOS, RHEL \u0438 Windows. 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