{"id":91364,"date":"2020-08-12T07:42:33","date_gmt":"2020-08-12T05:42:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/izuchaem-otsutstvuyushhuyu-bezopasnost-tipichnyh-ustanovok-docker-i-kubernetes"},"modified":"2020-08-12T07:42:33","modified_gmt":"2020-08-12T05:42:33","slug":"izuchaem-otsutstvuyushhuyu-bezopasnost-tipichnyh-ustanovok-docker-i-kubernetes","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/izuchaem-otsutstvuyushhuyu-bezopasnost-tipichnyh-ustanovok-docker-i-kubernetes","title":{"rendered":"Tanulm\u00e1nyozzuk a Docker \u00e9s Kubernetes tipikus telep\u00edt\u00e9seinek (hi\u00e1nyz\u00f3) biztons\u00e1g\u00e1t.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Tanulm\u00e1nyozzuk a Docker \u00e9s Kubernetes tipikus telep\u00edt\u00e9seinek (hi\u00e1nyz\u00f3) biztons\u00e1g\u00e1t.\" src=\"\/wp-content\/uploads\/2020\/08\/805ed8f509210fcfc4d912092cc540d1.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nT\u00f6bb mint 20 \u00e9ve dolgozom az IT ter\u00fclet\u00e9n, de valahogy a kont\u00e9nerekhez m\u00e9g nem jutottam el. Elm\u00e9letben \u00e9rtettem, hogyan m\u0171k\u00f6dnek, de mivel soha nem tal\u00e1lkoztam vel\u00fck gyakorlatban, nem voltam biztos benne, hogyan is m\u0171k\u00f6dnek pontosan a g\u00e9pezetek a kapott inform\u00e1ci\u00f3k alapj\u00e1n. <\/p>\n<p><\/p>\n<p>Emellett fogalmam sem volt arr\u00f3l, hogyan \u00e1llnak a biztons\u00e1ggal. De ism\u00e9t, az elm\u00e9let sz\u00e9pen hangzik, \u00e9s az a r\u00e9gi dal, hogy \"a biztons\u00e1g n\u00f6veked\u00e9s\u00e9vel cs\u00f6kken a haszn\u00e1lhat\u00f3s\u00e1g\", mindig ott motoszk\u00e1lt a fejemben. \u00cdgy gondoltam, ha ennyire k\u00f6nny\u0171 a kont\u00e9nerekkel dolgozni, akkor a biztons\u00e1guk t\u00fal alacsony szint\u0171. Mint kider\u00fclt, igazam volt.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Gyors kezdetk\u00e9ppen beiratkoztam egy <noindex><a rel=\"nofollow\" href=\"https:\/\/www.neowin.net\/news\/tags\/blackhat\">Black Hat<\/a><\/noindex> 2020-as tanfolyamra, amelynek c\u00edme \"<noindex><a rel=\"nofollow\" href=\"https:\/\/www.blackhat.com\/us-20\/training\/schedule\/listing.html#from-zero-to-hero---pentesting-and-securing-docker-swarm--kubernetes-environments-19045\">A s\u00e1rb\u00f3l a hercegs\u00e9gbe: behatol\u00e1s \u00e9s v\u00e9delem a Docker Swarm \u00e9s Kubernetes k\u00f6rnyezet\u00e9ben.<\/a><\/noindex>\u00bb. <\/p>\n<p><\/p>\n<p>A kurzust Sheila A. Berta \u00e9s Sol Ozzan vezette, \u00e9s azonnal a Docker kont\u00e9nerek m\u0171k\u00f6d\u00e9s\u00e9nek le\u00edr\u00e1s\u00e1val kezd\u0151d\u00f6tt, valamint azzal, hogy milyen utat j\u00e1rnak be a Kubernetes telep\u00edt\u00e9sekor. Ez teljesen gyakorlati foglalkoz\u00e1s volt - a di\u00e1koknak el\u0151z\u0151leg telep\u00edteni\u00fck kellett a Docker-t \u00e9s a microk8s-t a g\u00e9peikre - remek m\u00f3d arra, hogy l\u00e1ss\u00e1k az eszk\u00f6z\u00f6k k\u00f6z\u00f6tti interakci\u00f3t, megtal\u00e1lj\u00e1k a gyenge pontokat, \u00e9s ami a legfontosabb, megpr\u00f3b\u00e1lj\u00e1k azokat blokkolni.<\/p>\n<p><\/p>\n<p>Sajnos, b\u00e1r a kurzusok azt \u00edg\u00e9rt\u00e9k, hogy k\u00e9t nap alatt \"hercegg\u00e9\" v\u00e1lok, \u00e9reztem, hogy minden csak most kezd\u0151dik, \u00e9s m\u00e9g sokat kell tanulnom.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Tanulm\u00e1nyozzuk a Docker \u00e9s Kubernetes tipikus telep\u00edt\u00e9seinek (hi\u00e1nyz\u00f3) biztons\u00e1g\u00e1t.\" src=\"\/wp-content\/uploads\/2020\/08\/e7afd728bb757ac1e0c14d06c5e03806.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Miel\u0151tt belemer\u00fcln\u00e9k a magas szint\u0171 megfigyel\u00e9seimbe, fontos megmagyar\u00e1zni, mi is az a kont\u00e9ner. A fejleszt\u00e9s vil\u00e1g\u00e1ban norm\u00e1lis helyzetnek sz\u00e1m\u00edt, hogy a saj\u00e1t g\u00e9p\u00e9n \u00edrt k\u00f3d t\u00f6k\u00e9letesen m\u0171k\u00f6dik, de amikor megpr\u00f3b\u00e1lja futtatni valahol egy szerveren \u2013 egyszer\u0171en nem m\u0171k\u00f6dik. A kont\u00e9nerek azt a probl\u00e9m\u00e1t pr\u00f3b\u00e1lj\u00e1k lek\u00fczdeni, hogy auton\u00f3m g\u00e9peket k\u00edn\u00e1lnak, amelyeket k\u00f6nnyen \u00e1t lehet vinni egyik szerverr\u0151l a m\u00e1sikra, biztos tudva, hogy mindig m\u0171k\u00f6dni fognak. Ahogy a neve is mutatja, tartalmazza a m\u0171k\u00f6d\u00e9shez sz\u00fcks\u00e9ges k\u00f3dot, k\u00f6nyvt\u00e1rakat \u00e9s egy\u00e9b szoftvereket. A Kubernetes ezzel szemben egy <noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/concepts\/overview\/what-is-kubernetes\/\">kont\u00e9ner-orkestr\u00e1l\u00f3 platform.<\/a><\/noindex>Alapvet\u0151en ezzel a seg\u00edts\u00e9g\u00e9vel z\u00f6kken\u0151mentesen kezelhet\u00fcnk sz\u00e1z vagy ak\u00e1r ezer k\u00fcl\u00f6nb\u00f6z\u0151 kont\u00e9nert.<\/p>\n<p><\/p>\n<p>Al\u00e1bb n\u00e9h\u00e1ny k\u00f6vetkeztet\u00e9sem a v\u00f6r\u00f6s \u00e9s k\u00e9k csapat szemsz\u00f6g\u00e9b\u0151l.<\/p>\n<p><\/p>\n<h2 id=\"krasnaya-komanda\">V\u00f6r\u00f6s csapat<\/h2>\n<p><\/p>\n<p><strong>A kont\u00e9nerek t\u00f6bbs\u00e9ge root m\u00f3don fut.<\/strong>: ez azt jelenti, hogy ha megkompromitt\u00e1lja a kont\u00e9nert, akkor teljes hozz\u00e1f\u00e9r\u00e9st kap a kont\u00e9nerhez. Ez jelent\u0151sen megk\u00f6nny\u00edti a tov\u00e1bbi l\u00e9p\u00e9seket.<\/p>\n<p><\/p>\n<p><strong>A docker.sock kont\u00e9neren bel\u00fcli bek\u00f6t\u00e9se vesz\u00e9lyes<\/strong>: ha root hozz\u00e1f\u00e9r\u00e9st szerzett a kont\u00e9neren bel\u00fcl, \u00e9s Docker-t is telep\u00edtett a Docker socket-tel rendelkez\u0151 kont\u00e9nerben (\/var\/run\/docker.sock), akkor potenci\u00e1lisan lehet\u0151s\u00e9ge van az eg\u00e9sz klaszter felt\u00e9rk\u00e9pez\u00e9s\u00e9re, bele\u00e9rtve b\u00e1rmely m\u00e1sik kont\u00e9nerhez val\u00f3 hozz\u00e1f\u00e9r\u00e9st is. Az ilyen hozz\u00e1f\u00e9r\u00e9st se h\u00e1l\u00f3zati elszigetel\u00e9s, se m\u00e1s m\u00f3don nem lehet megakad\u00e1lyozni.<\/p>\n<p><\/p>\n<p><strong>A k\u00f6rnyezeti v\u00e1ltoz\u00f3k gyakran titkos adatokat tartalmaznak<\/strong>: a legt\u00f6bb esetben az emberek jelszavakat k\u00fcldenek a kont\u00e9nerbe hagyom\u00e1nyos k\u00f6rnyezeti v\u00e1ltoz\u00f3kon kereszt\u00fcl. Teh\u00e1t, ha hozz\u00e1f\u00e9r\u00e9se van a fi\u00f3khoz, akkor megn\u00e9zheti ezeket a k\u00f6rnyezeti v\u00e1ltoz\u00f3kat, hogy k\u00e9s\u0151bb kib\u0151v\u00edtse a jogosults\u00e1gait.<\/p>\n<p><\/p>\n<p><strong>A Docker API rengeteg inform\u00e1ci\u00f3t adhat ki<\/strong>: alap\u00e9rtelmezett be\u00e1ll\u00edt\u00e1sok mellett a Docker API enged\u00e9lyez\u00e9s n\u00e9lk\u00fcl m\u0171k\u00f6dik, \u00e9s rengeteg inform\u00e1ci\u00f3t adhat ki. A Shodan seg\u00edts\u00e9g\u00e9vel k\u00f6nnyen tal\u00e1lhat egy list\u00e1t a nyitott portokr\u00f3l, majd r\u00e9szletes inform\u00e1ci\u00f3t szerezhet a klaszterr\u0151l \u2014 \u00e9s teljes k\u00f6r\u0171 \u00e1tveheti azt. A TrendMicro err\u0151l \u00edrt <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.trendmicro.com\/trendlabs-security-intelligence\/exposed-docker-control-api-and-community-image-abused-to-deliver-cryptocurrency-mining-malware\/\">egy \u00e9rdekes cikket<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h2 id=\"sinyaya-komanda\">K\u00e9k csapat<\/h2>\n<p><\/p>\n<p><strong>Ne futtassa a kont\u00e9nerek tartalm\u00e1t root-k\u00e9nt<\/strong>: noha a root jogosults\u00e1ggal val\u00f3 ind\u00edt\u00e1s egyszer\u0171bb, ezt nem szabad tennie. Ehelyett futtassa az alkalmaz\u00e1sokat cs\u00f6kkentett jogosults\u00e1gokkal, ak\u00e1r a uid megjelen\u00edt\u00e9s\u00e9vel, ak\u00e1r a --user param\u00e9ter megad\u00e1s\u00e1val a CLI haszn\u00e1lata k\u00f6zben, vagy a USER megad\u00e1s\u00e1val a Dockerfile-ban.<\/p>\n<p><\/p>\n<p><strong>Ne engedje a programok telep\u00edt\u00e9s\u00e9t a kont\u00e9nereken bel\u00fcl<\/strong>: szinte minden t\u00e1mad\u00e1s valaminek a telep\u00edt\u00e9s\u00e9vel kezd\u0151dik. Kezdve az nmap-t\u0151l \u00e9s az ifconfig-t\u00f3l, mind a Dockerig (a kont\u00e9neren bel\u00fcl), valaminek a telep\u00edt\u00e9se a kont\u00e9nerben szok\u00e1sos dolog volt. Ugyanazon okb\u00f3l mindig blokkolni kell az \u00f6sszes nem haszn\u00e1lt portot. Ez szint\u00e9n seg\u00edt megakad\u00e1lyozni a vez\u00e9rl\u0151 parancsok \u00e1tad\u00e1s\u00e1t g\u00e9pe megfert\u0151z\u0151d\u00e9sekor. A programok telep\u00edt\u00e9se mellett \u00e9rdemes biztos\u00edtani, hogy a kont\u00e9nerben csak a feladat v\u00e9grehajt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges minim\u00e1lis sz\u00e1m\u00fa alkalmaz\u00e1s legyen telep\u00edtve.<\/p>\n<p><\/p>\n<p><strong>V\u00e9dekezzen a docker.sock ellen<\/strong>: v\u00e9deni kell, mivel ezen a socketen kereszt\u00fcl t\u00f6rt\u00e9nik a kommunik\u00e1ci\u00f3 a kont\u00e9ner \u00e9s a klaszter k\u00f6z\u00f6tt. Mivel nem szeretn\u00e9k a r\u00e9szletekbe belemenni ebben a cikkben, olvassa el <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.docker.com\/engine\/security\/https\/\">a Docker jegyzet\u00e9t<\/a><\/noindex>, hogy mi t\u00f6rt\u00e9nhet, \u00e9s hogyan lehet ezeket mind blokkolni.<\/p>\n<p><\/p>\n<p><strong>Haszn\u00e1lja a Docker titkokat a k\u00f6rnyezeti v\u00e1ltoz\u00f3k helyett<\/strong>: Vannak titkok <noindex><a rel=\"nofollow\" href=\"https:\/\/www.docker.com\/blog\/docker-secrets-management\/\">kb. 2017 \u00f3ta<\/a><\/noindex>. B\u00e1r ez nem biztons\u00e1gos, m\u00e9gis jobb, mint a k\u00f6rnyezeti v\u00e1ltoz\u00f3k a titkos adatok kont\u00e9nerbe val\u00f3 \u00e1tad\u00e1s\u00e1hoz.<\/p>\n<p><\/p>\n<p>Ha az \u00edr\u00e1s felkeltette az \u00e9rdekl\u0151d\u00e9s\u00e9t a kont\u00e9nerek ir\u00e1nt \u2013 el\u00e9g k\u00f6nnyen telep\u00edthet\u0151 a Docker vagy a microk8s (a Kubernetes kisebb v\u00e1ltozata). <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.docker.com\/engine\/install\/\">Itt<\/a><\/noindex> Itt tal\u00e1lhat\u00f3ak a Docker telep\u00edt\u00e9si \u00fatmutat\u00f3i Linuxra \u00e9s MacOS-ra, valamint <noindex><a rel=\"nofollow\" href=\"https:\/\/microk8s.io\/\">itt<\/a><\/noindex> \u2014 a microk8s telep\u00edt\u00e9si \u00fatmutat\u00f3i Windowsra, Linuxra \u00e9s MacOS-ra.<\/p>\n<p><\/p>\n<p>A telep\u00edt\u00e9s ut\u00e1n megismerheti <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.docker.com\/get-started\/\">ezt a gyorsind\u00edt\u00e1si \u00fatmutat\u00f3t<\/a><\/noindex> a Docker-t\u0151l, hasonl\u00f3 opci\u00f3 <noindex><a rel=\"nofollow\" href=\"https:\/\/microk8s.io\/docs\">aj\u00e1nlott<\/a><\/noindex> \u00e9s a microk8s-hez.<\/p>\n<p><\/p>\n<p>Ha van kedve vagy sz\u00fcks\u00e9ge van egy \u00e1tfog\u00f3 Docker tanfolyam elv\u00e9gz\u00e9s\u00e9re, ahol gyakorl\u00f3 szakemberek elemzik az \u00f6sszes eszk\u00f6z\u00e9t: az alapvet\u0151 absztrakci\u00f3kt\u00f3l a h\u00e1l\u00f3zati be\u00e1ll\u00edt\u00e1sokig, a k\u00fcl\u00f6nb\u00f6z\u0151 oper\u00e1ci\u00f3s rendszerek \u00e9s programoz\u00e1si nyelvek finoms\u00e1gaiig, pr\u00f3b\u00e1lja ki a \"<noindex><a rel=\"nofollow\" href=\"http:\/\/to.slurm.io\/t2D-uA\">Videokurzus a Docker-r\u0151l<\/a><\/noindex>\". Megismerkedhet a technol\u00f3gi\u00e1val, \u00e9s meg\u00e9rtheti, hol \u00e9s hogyan \u00e9rdemes a Dockert haszn\u00e1lni. Emellett megkapja a legjobb gyakorlatokat \u2014 jobb biztons\u00e1gban \u00e9s gyakorl\u00f3kt\u00f3l kapott t\u00e1mogat\u00e1ssal tanulni a tapasztalatokkal, mint saj\u00e1t tapasztalatokon kereszt\u00fcl.<\/p>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/southbridge\/blog\/514528\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042f \u0440\u0430\u0431\u043e\u0442\u0430\u044e \u0432 IT \u0431\u043e\u043b\u044c\u0448\u0435 20 \u043b\u0435\u0442, \u043d\u043e \u043a\u0430\u043a-\u0442\u043e \u0440\u0443\u043a\u0438 \u043d\u0435 \u0434\u043e\u0445\u043e\u0434\u0438\u043b\u0438 \u0434\u043e \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432. \u0412 \u0442\u0435\u043e\u0440\u0438\u0438 \u044f \u043f\u043e\u043d\u0438\u043c\u0430\u043b, \u043a\u0430\u043a \u043e\u043d\u0438 \u0443\u0441\u0442\u0440\u043e\u0435\u043d\u044b \u0438 \u043a\u0430\u043a \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0442. \u041d\u043e \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u044f \u043d\u0438\u043a\u043e\u0433\u0434\u0430 \u0441 \u043d\u0438\u043c\u0438 \u043d\u0435 \u0441\u0442\u0430\u043b\u043a\u0438\u0432\u0430\u043b\u0441\u044f \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 \u2014 \u044f \u043d\u0435 \u0431\u044b\u043b \u0443\u0432\u0435\u0440\u0435\u043d \u0432 \u0442\u043e\u043c, \u043a\u0430\u043a \u0438\u043c\u0435\u043d\u043d\u043e \u043a\u0440\u0443\u0442\u044f\u0442\u0441\u044f-\u0432\u0435\u0440\u0442\u044f\u0442\u0441\u044f \u0443 \u043d\u0438\u0445 \u0448\u0435\u0441\u0442\u0435\u0440\u0451\u043d\u043a\u0438 \u043f\u043e\u0434 \u043a\u0430\u043f\u043e\u0442\u043e\u043c. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u044f \u0431\u044b\u043b \u0431\u0435\u0437 \u043f\u043e\u043d\u044f\u0442\u0438\u044f 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