{"id":114198,"date":"2024-03-08T12:25:48","date_gmt":"2024-03-08T10:25:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opublikovan-pochtovyj-server-postfix-3-9-0"},"modified":"2024-03-08T12:25:48","modified_gmt":"2024-03-08T10:25:48","slug":"opublikovan-pochtovyj-server-postfix-3-9-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/opublikovan-pochtovyj-server-postfix-3-9-0","title":{"rendered":"Megjelent a Postfix 3.9.0 levelez\u0151szerver.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A k\u00f6zel egy \u00e9v fejleszt\u00e9s ut\u00e1n megjelent a Postfix levelez\u0151szerver \u00faj stabil verzi\u00f3ja - 3.9.0. Ezzel egy id\u0151ben bejelentett\u00e9k a 2020 elej\u00e9n kiadott Postfix 3.5 t\u00e1mogat\u00e1s\u00e1nak megsz\u00fcntet\u00e9s\u00e9t. A Postfix az egyik ritka projekt, amely egyszerre \u00f6tv\u00f6zi a magas biztons\u00e1got, megb\u00edzhat\u00f3s\u00e1got \u00e9s teljes\u00edtm\u00e9nyt, amit a szigor\u00fa k\u00f3dform\u00e1z\u00e1si \u00e9s jav\u00edt\u00f3 audit politik\u00e1val \u00e9s az \u00e1tgondolt architekt\u00far\u00e1val siker\u00fclt el\u00e9rni. A projekt k\u00f3dja C nyelven k\u00e9sz\u00fclt, \u00e9s az EPL 2.0 (Eclipse Public License) \u00e9s IPL 1.0 (IBM Public License) licenc alatt terjesztik.    <\/p>\n<p> A janu\u00e1ri automatikus felm\u00e9r\u00e9s szerint k\u00f6r\u00fclbel\u00fcl 400 ezer levelez\u0151szerver <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/\"   title=\"szerverek\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1499\">szerverek<\/a>, a Postfixet a levelez\u0151szerverek 36.81%-\u00e1n (egy \u00e9vvel ezel\u0151tt 33.18%) haszn\u00e1lj\u00e1k, m\u00edg az Exim r\u00e9szesed\u00e9se 56.61% (egy \u00e9vvel ezel\u0151tt 60.27%), a Sendmail-\u00e9 3.60% (3.62%), a MailEnable-\u00e9 1.82% (1.86%), a MDaemon-\u00e9 0.40% (0.39%), a Microsoft Exchange-\u00e9 0.19% (0.19%), az OpenSMTPD-\u00e9 0.09% (0.06%).    <center><img decoding=\"async\" alt=\"Megjelent a Postfix 3.9.0 levelez\u0151szerver.\" src=\"\/wp-content\/uploads\/2024\/03\/e675c9211d656f8603bcbc42ad9b67bf.gif\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>F\u0151bb \u00faj\u00edt\u00e1sok:  <\/p>\n<ul>\n<li class=\"l\"> MongoDB kliens ker\u00fclt hozz\u00e1ad\u00e1sra, amely lehet\u0151v\u00e9 teszi virtu\u00e1lis felhaszn\u00e1l\u00f3i adatb\u00e1zisok, aliasok, c\u00edmk\u00e9pez\u00e9si list\u00e1k \u00e9s k\u00fcl\u00f6nb\u00f6z\u0151 ellen\u0151rz\u0151 t\u00e1bl\u00e1k t\u00e1rol\u00e1s\u00e1t ebben az adatb\u00e1zis-kezel\u0151 rendszerben. A MongoDB-hez val\u00f3 kapcsol\u00f3d\u00e1s be\u00e1ll\u00edt\u00e1s\u00e1hoz \u00faj t\u00e1blat\u00edpus ker\u00fclt bevezet\u00e9sre: \u201emongodb\u201d. P\u00e9ld\u00e1ul: \u201ealias_maps = proxy:mongodb:\/etc\/postfix\/mongo.cf\u201d, ahol a mongo.cf a MongoDB-hez val\u00f3 kapcsol\u00f3d\u00e1si \u00e9s lek\u00e9rdez\u00e9si be\u00e1ll\u00edt\u00e1sokat tartalmaz\u00f3 f\u00e1jl.\n<li class=\"l\"> A helyi k\u00e9zbes\u00edt\u00e9si \u00fcgyn\u00f6kbe hozz\u00e1ad\u00f3dott a k\u00f6rlev\u00e9l azonos\u00edt\u00f3j\u00e1nak export\u00e1l\u00e1sa, amelyet az SMTP munkamenet sor\u00e1n az ENVID (Envelope ID) param\u00e9terrel k\u00f6zvet\u00edtettek az ESMTP MAIL parancsban (RFC 3461). Az azonos\u00edt\u00f3 az ENVID k\u00f6rnyezeti v\u00e1ltoz\u00f3ba ker\u00fcl, \u00e9s az \u00fcgyn\u00f6k a pipe k\u00e9zbes\u00edt\u0151be az \u201e${envid}\u201d parancssori param\u00e9terrel ker\u00fcl tov\u00e1bb\u00edt\u00e1sra.\n<li class=\"l\"> A MySQL (\u201emysql:\u201d ) \u00e9s PostgreSQL (\u201epgsql:\u201d ) adathalmoz\u00f3khoz \u00faj param\u00e9terek ker\u00fcltek bevezet\u00e9sre: az \u201eidle_interval\u201d a kapcsolat inaktivit\u00e1s\u00e1nak idej\u00e9nek meghat\u00e1roz\u00e1s\u00e1ra \u00e9s a \u201eretry_interval\u201d, amely a k\u00e9r\u00e9sek \u00fajrak\u00fcld\u00e9s\u00e9nek id\u0151z\u00edt\u0151j\u00e9t hat\u00e1rozza meg. Alap\u00e9rtelmez\u00e9s szerint ezek \u00e9rt\u00e9ke 60 m\u00e1sodperc. A \u201eretry_interval\u201d \u00e9rt\u00e9k\u00e9t cs\u00f6kkenteni lehet p\u00e9ld\u00e1ul a hib\u00e1k ut\u00e1ni helyre\u00e1ll\u00edt\u00e1si id\u0151 ler\u00f6vid\u00edt\u00e9s\u00e9re, ha csak egy szerver tal\u00e1lhat\u00f3 a \u201ehosts\u201d attrib\u00fatumban.\n<li class=\"l\"> A MySQL klienshez hozz\u00e1ad\u00e1sra ker\u00fclt a \u201echarset\u201d be\u00e1ll\u00edt\u00e1s az alap\u00e9rtelmezett karakterk\u00f3dol\u00e1s megad\u00e1s\u00e1hoz. Alap\u00e9rtelmezettk\u00e9nt a \u201eutf8mb4\u201d \u00e9rt\u00e9ket haszn\u00e1lja, amely megfelel a MySQL 8.0 alap\u00e9rtelmezett be\u00e1ll\u00edt\u00e1sainak (kor\u00e1bbi verzi\u00f3kban a \u201elatin1\u201d \u00e9rt\u00e9ket haszn\u00e1lt\u00e1k). A MySQL 4.0-n\u00e1l r\u00e9gebbi verzi\u00f3k (teh\u00e1t a 2003 el\u0151tt kiadott verzi\u00f3k) t\u00e1mogat\u00e1sa megsz\u0171nt.\n<li class=\"l\"> Lehet\u0151s\u00e9get biztos\u00edtanak a TLS-hez, nem CA-ra megk\u00f6t\u00f6tt, \u00f6nal\u00e1\u00edrt (raw) nyilv\u00e1nos kulcs ig\u00e9nyl\u00e9s\u00e9re az X.509 tan\u00fas\u00edtv\u00e1ny helyett. Az \u00fcgyfelek \u00e9s szerverek azonos\u00edt\u00e1s\u00e1hoz t\u00f6rt\u00e9n\u0151 raw-kulcsok haszn\u00e1lata a &#171;smtpd_tls_enable_rpk = yes&#187; \u00e9s az &#171;smtp_tls_enable_rpk = yes&#187; param\u00e9tereken kereszt\u00fcl enged\u00e9lyezhet\u0151, de a hiteles\u00edt\u00e9s ellen\u0151rz\u00e9s\u00e9nek viselked\u00e9se er\u0151sen f\u00fcgg a be\u00e1ll\u00edtott biztons\u00e1gi szintt\u0151l \u00e9s a raw-kulcsok helyi TLS-implement\u00e1ci\u00f3ban val\u00f3 t\u00e1mogat\u00e1s\u00e1t\u00f3l (l\u00e1sd a dokument\u00e1ci\u00f3t).\n<li class=\"l\"> Bevezet\u00e9sre ker\u00fclt az OpenSSL konfigur\u00e1ci\u00f3s f\u00e1jlok kezdeti t\u00e1mogat\u00e1sa. A TLS be\u00e1ll\u00edt\u00e1sok f\u00e1jlra mutat\u00f3 hivatkoz\u00e1s megad\u00e1s\u00e1hoz a tls_config_file param\u00e9ter javasolt, m\u00edg a konfigur\u00e1ci\u00f3s f\u00e1jlban tal\u00e1lhat\u00f3 be\u00e1ll\u00edt\u00e1si szakasz nev\u00e9t a &#171;tls_config_name&#187; param\u00e9ter seg\u00edts\u00e9g\u00e9vel lehet megadni. Az OpenSSL konfigur\u00e1ci\u00f3s f\u00e1jlokhoz val\u00f3 k\u00f6t\u0151d\u00e9s cs\u00f6kkentheti a disztrib\u00faci\u00f3s be\u00e1ll\u00edt\u00e1sokt\u00f3l val\u00f3 f\u00fcgg\u0151s\u00e9get, amelyek biztons\u00e1gi szintj\u00e9nek v\u00e1ltoz\u00e1sa n\u00f6velheti a titkos\u00edtatlanul k\u00fcld\u00f6tt \u00fczenetek ar\u00e1ny\u00e1t.\n<li class=\"l\"> Az \u00fczenetek fejl\u00e9c\u00e9ben v\u00e1ltozott a napok sz\u00e1m\u00e1nak form\u00e1tuma - a 1-9 k\u00f6z\u00f6tti napok most null\u00e1val eg\u00e9sz\u00fclnek ki, nem pedig sz\u00f3k\u00f6zzel (azaz &#171;01&#187;, &#171;02&#187; stb.). Ezt a v\u00e1ltoz\u00e1st az RFC 5322 aj\u00e1nl\u00e1sa indokolja, amely egyetlen sz\u00f3k\u00f6zt javasol elv\u00e1laszt\u00f3k\u00e9nt a d\u00e1tumokban.\n<li class=\"l\"> V\u00e9delmet vezettek be a &#171;Blind&#187; t\u00edpus\u00fa t\u00e1mad\u00e1sok ellen (web kliens SSRF-t\u00e1mad\u00e1sok, amelyek a SMTP-n kereszt\u00fcli szerver el\u00e9r\u00e9s\u00e9re ir\u00e1nyulnak), amelyet a &#171;smtpd_forbid_unauth_pipelining = yes&#187; (alap\u00e9rtelmez\u00e9s szerint) be\u00e1ll\u00edt\u00e1s mellett alkalmaznak.\n<li class=\"l\"> Alap\u00e9rtelmez\u00e9s szerint az &#171;smtpd_forbid_bare_newline = normalize&#187; be\u00e1ll\u00edt\u00e1s enged\u00e9lyezve van, amely v\u00e9di a szervert az &#171;SMTP smuggling&#187; t\u00edpus\u00fa t\u00e1mad\u00e1sok ellen, amelyek lehet\u0151v\u00e9 teszik egy \u00fczenet feloszt\u00e1s\u00e1t t\u00f6bb k\u00fcl\u00f6nb\u00f6z\u0151 \u00fczenetre nem szabv\u00e1nyos elv\u00e1laszt\u00f3 haszn\u00e1lat\u00e1val. Tov\u00e1bb\u00e1 v\u00e9delem ker\u00fclt bevezet\u00e9sre a kimen\u0151 SMTP smuggling t\u00e1mad\u00e1sok ellen, amikor a t\u00e1mad\u00f3 a Postfix alap\u00fa szervert haszn\u00e1lja egy m\u00e1sik SMTP szerver elleni t\u00e1mad\u00e1sra. Az &#171;cleanup_replace_stray_cr_lf = yes&#187; be\u00e1ll\u00edt\u00e1s alap\u00e9rtelmez\u00e9s szerint enged\u00e9lyezve van, amely a felesleges &lt;CR&gt; \u00e9s &lt;LF&gt; karaktereket sz\u00f3k\u00f6zre cser\u00e9li.\n<li class=\"l\"> A DNS kliens implement\u00e1ci\u00f3ban a DNS lek\u00e9rdez\u00e9sekb\u0151l visszaadott eredm\u00e9nyek m\u00e9rete mostant\u00f3l 100 bejegyz\u00e9sre van korl\u00e1tozva, ami 20-szor t\u00f6bb, mint a SMTP kliens maxim\u00e1lisan t\u00e1mogatott mennyis\u00e9ge. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/lir\/ipv4\/\"   title=\"IP-c\u00edmek\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"816\">IP-c\u00edmek<\/a> egy szerver eset\u00e9n.\n<li class=\"l\"> Elavult kateg\u00f3ri\u00e1ba ker\u00fclt a &#171;disable_dns_lookup&#187; \u00e9s a &#171;permit_mx_backup&#187; param\u00e9ter, valamint n\u00e9h\u00e1ny TLS be\u00e1ll\u00edt\u00f3 param\u00e9ter.\n<li class=\"l\"> Megsz\u00fcntett\u00e9k a k\u00f6r\u00fclbel\u00fcl 20 \u00e9ve elavultnak nyilv\u00e1n\u00edtott be\u00e1ll\u00edt\u00e1sok t\u00e1mogat\u00e1s\u00e1t: &#171;permit_naked_ip_address&#187;, &#171;check_relay_domains&#187; \u00e9s &#171;reject_maps_rbl&#187;.            <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60749\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u043f\u043e\u0447\u0442\u0438 \u0433\u043e\u0434\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0441\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 \u043d\u043e\u0432\u043e\u0439 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Postfix &#8212; 3.9.0. \u0412 \u0442\u043e \u0436\u0435 \u0432\u0440\u0435\u043c\u044f \u043e\u0431\u044a\u044f\u0432\u043b\u0435\u043d\u043e \u043e \u043f\u0440\u0435\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u0438 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u0432\u0435\u0442\u043a\u0438 Postfix 3.5, \u0432\u044b\u043f\u0443\u0449\u0435\u043d\u043d\u043e\u0439 \u0432 \u043d\u0430\u0447\u0430\u043b\u0435 2020 \u0433\u043e\u0434\u0430. 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