{"id":86311,"date":"2020-06-24T01:42:11","date_gmt":"2020-06-23T23:42:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/lomaem-klaster-kubernetes-cherez-helm-v2-tiller"},"modified":"2020-06-24T01:42:11","modified_gmt":"2020-06-23T23:42:11","slug":"lomaem-klaster-kubernetes-cherez-helm-v2-tiller","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/lomaem-klaster-kubernetes-cherez-helm-v2-tiller","title":{"rendered":"Vi hacker Kubernetes klyngen via Helm v2 tiller","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Vi hacker Kubernetes klyngen via Helm v2 tiller\" src=\"\/wp-content\/uploads\/2020\/06\/9fced786f84d95b0291c33eef4012828.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Helm \u2014 en pakkestyrer til Kubernetes, noget lignende <code>apt-get<\/code> til Ubuntu. I denne note vil vi se p\u00e5 den tidligere version af helm (v2) med tjenesten tiller forudinstalleret, som giver os adgang til klyngen.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Lad os forberede klyngen ved at k\u00f8re kommandoen:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">kubectl run --rm --restart=Never -it --image=madhuakula\/k8s-goat-helm-tiller -- bash<\/code><\/pre>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Vi hacker Kubernetes klyngen via Helm v2 tiller\" src=\"\/wp-content\/uploads\/2020\/06\/6b5ac23e43a57548ee7a0a90e0d1a3f5.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<h2 id=\"demonstraciya\">Demonstration<\/h2>\n<p><\/p>\n<ul>\n<li>Hvis der ikke foretages yderligere indstillinger, starter helm v2 tjenesten tiller, som har RBAC med fulde administratorrettigheder til klyngen.<\/li>\n<li>Efter installationen i namespace <code>kube-system<\/code> vises <code>tiller-deploy<\/code>, \u00e5bnes port 44134, bundet til 0.0.0.0. Dette kan kontrolleres ved hj\u00e6lp af telnet.<\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"plaintext\">$ telnet tiller-deploy.kube-system 44134<\/code><\/pre>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Vi hacker Kubernetes klyngen via Helm v2 tiller\" src=\"\/wp-content\/uploads\/2020\/06\/9f6dccf8380ef5cba905bcd0f2785778.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<ul>\n<li>Nu kan vi oprette forbindelse til tjenesten tiller. Vi vil bruge bin\u00e6ren helm til at udf\u00f8re operationer ved kommunikation med tjenesten tiller:<\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"plaintext\">$ helm --host tiller-deploy.kube-system:44134 version<\/code><\/pre>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Vi hacker Kubernetes klyngen via Helm v2 tiller\" src=\"\/wp-content\/uploads\/2020\/06\/34d6abdc649f21b3124b0569779e2e40.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<ul>\n<li>Lad os fors\u00f8ge at hente hemmeligheder fra Kubernetes-klyngen i namespace <code>kube-system<\/code>:<\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"plaintext\">$ kubectl get secrets -n kube-system<\/code><\/pre>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Vi hacker Kubernetes klyngen via Helm v2 tiller\" src=\"\/wp-content\/uploads\/2020\/06\/7c4d24f4fb518574e2c41d51239d5466.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<ul>\n<li>Nu kan vi oprette vores eget chart, hvor vi opretter en rolle med administratorrettigheder og tildeler denne rolle til den standard servicekonto. Ved at bruge tokenet fra denne servicekonto fik vi fuld adgang til vores klynge.<\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"plaintext\">$ helm --host tiller-deploy.kube-system:44134 install \/pwnchart<\/code><\/pre>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Vi hacker Kubernetes klyngen via Helm v2 tiller\" src=\"\/wp-content\/uploads\/2020\/06\/103412d1497efb0370f5faf7087b66d1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<ul>\n<li>Nu, n\u00e5r <code>pwnchart<\/code> er blevet implementeret, har standard servicekontoen fuld administrative rettigheder. Lad os kontrollere h\u00e6mtning af hemmeligheder igen fra <code>kube-system<\/code><\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"plaintext\">kubectl get secrets -n kube-system<\/code><\/pre>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Vi hacker Kubernetes klyngen via Helm v2 tiller\" src=\"\/wp-content\/uploads\/2020\/06\/58fc4da5f4e5a4d8c4117e9298e2740f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>En vellykket udf\u00f8relse af dette script afh\u00e6nger af, hvordan tiller er blevet implementeret, nogle gange implementerer administratorer det i et separat namespace med andre privilegier. Helm 3 er ikke udsat for s\u00e5danne s\u00e5rbarheder, da den ikke har tiller.<\/p>\n<p><\/p>\n<p><em><strong>Overs\u00e6tterens note:<\/strong> brugen af netv\u00e6rkspolitikker til at filtrere trafik i klyngen hj\u00e6lper med at beskytte mod s\u00e5rbarheder af denne type. <\/em><\/p>\n<p>Kilde: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/southbridge\/blog\/507656\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>Helm \u2014 \u043f\u0430\u043a\u0435\u0442\u043d\u044b\u0439 \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440 \u0434\u043b\u044f Kubernetes, \u0447\u0442\u043e-\u0442\u043e \u0432\u0440\u043e\u0434\u0435 apt-get \u0434\u043b\u044f Ubuntu. \u0412 \u044d\u0442\u043e\u0439 \u0437\u0430\u043c\u0435\u0442\u043a\u0435 \u043c\u044b \u0443\u0432\u0438\u0434\u0438\u043c \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e helm (v2) \u0441 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u043c tiller, \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u043c \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e, \u0447\u0435\u0440\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0443. \u041f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043c \u043a\u043b\u0430\u0441\u0442\u0435\u0440, \u0434\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u043c \u043a\u043e\u043c\u0430\u043d\u0434\u0443: kubectl run &#8212;rm &#8212;restart=Never -it &#8212;image=madhuakula\/k8s-goat-helm-tiller &#8212; bash \u0414\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0430\u0446\u0438\u044f \u0415\u0441\u043b\u0438 \u043d\u0438\u0447\u0435\u0433\u043e \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043d\u0435 \u043d\u0430\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0442\u044c, helm v2 \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":86312,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-86311","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"Helm \u2014 \u043f\u0430\u043a\u0435\u0442\u043d\u044b\u0439 \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440 \u0434\u043b\u044f.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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