{"id":37675,"date":"2019-10-31T22:18:59","date_gmt":"2019-10-31T19:18:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/opublikovan-dhcp-server-kea-1-6-razvivaemyj-konsortsiumom-isc\/"},"modified":"2019-10-31T22:18:59","modified_gmt":"2019-10-31T19:18:59","slug":"opublikovan-dhcp-server-kea-1-6-razvivaemyj-konsortsiumom-isc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/opublikovan-dhcp-server-kea-1-6-razvivaemyj-konsortsiumom-isc","title":{"rendered":"Publicado o servidor DHCP Kea 1.6, desenvolvido pelo cons\u00f3rcio ISC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Cons\u00f3rcio ISC <noindex><a rel=\"nofollow\" href=\"https:\/\/www.isc.org\/blogs\/kea-1-6\/\">publicou<\/a><\/noindex> lan\u00e7amento do servidor DHCP <noindex><a rel=\"nofollow\" href=\"http:\/\/kea.isc.org\">Kea 1.6.0<\/a><\/noindex>, que substitui o cl\u00e1ssico ISC DHCP. Os c\u00f3digos-fonte do projeto <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/isc-projects\/kea\">s\u00e3o distribu\u00eddos<\/a><\/noindex> sob licen\u00e7a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=32726\">Mozilla Public License (MPL) 2.0<\/a><\/noindex>, em vez da licen\u00e7a ISC License anteriormente utilizada para o ISC DHCP. <\/p>\n<p>O servidor DHCP Kea \u00e9 baseado nas tecnologias BIND 10 e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=36235\">constru\u00eddo<\/a><\/noindex> com uma arquitetura modular, que divide a funcionalidade em diferentes processos manipuladores. O produto inclui uma implementa\u00e7\u00e3o completa do servidor com suporte para os protocolos DHCPv4 e DHCPv6, sendo capaz de substituir o ISC DHCP. O Kea possui mecanismos integrados para atualiza\u00e7\u00e3o din\u00e2mica de zonas DNS (Dynamic DNS), suporta mecanismos de descoberta de servidores, atribui\u00e7\u00e3o de endere\u00e7os, atualiza\u00e7\u00f5es e reconex\u00f5es, atendimento a consultas informativas, reserva de endere\u00e7os para hosts e inicializa\u00e7\u00e3o PXE. Na implementa\u00e7\u00e3o do DHCPv6, existe ainda a possibilidade de delega\u00e7\u00e3o de prefixos. Para intera\u00e7\u00e3o com aplicativos externos, \u00e9 fornecida uma API especial. A configura\u00e7\u00e3o pode ser atualizada em tempo real sem a necessidade de reiniciar o servidor.<\/p>\n<p>As informa\u00e7\u00f5es sobre endere\u00e7os dedicados e par\u00e2metros dos clientes podem ser armazenadas em diferentes tipos de reposit\u00f3rios \u2014 atualmente, s\u00e3o fornecidos backends para armazenamento em arquivos CSV, bancos de dados MySQL, Apache Cassandra e PostgreSQL. Os par\u00e2metros de reserva de hosts podem ser especificados em um arquivo de configura\u00e7\u00e3o no formato JSON ou como uma tabela no MySQL e PostgreSQL. Inclui a ferramenta perfdhcp para medir o desempenho do servidor DHCP e componentes para coleta de estat\u00edsticas. O Kea demonstra um bom desempenho; por exemplo, ao usar o backend MySQL, o servidor pode realizar 1000 atribui\u00e7\u00f5es de endere\u00e7os por segundo (cerca de 4000 pacotes por segundo), e ao usar o backend memfile, o desempenho atinge 7500 atribui\u00e7\u00f5es por segundo.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"http:\/\/bind10.isc.org\/raw-attachment\/wiki\/DesignDiagrams\/Overview-DHCP-2013-01-16.png\"><img decoding=\"async\" alt=\"Publicado o servidor DHCP Kea 1.6, desenvolvido pelo cons\u00f3rcio ISC \" src=\"\/wp-content\/uploads\/2019\/09\/506faa6784a89a80eb89611b1cc11a24.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Principais <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.isc.org\/isc\/kea\/1.6.0\/Kea160ReleaseNotes.txt\">s\u00e3o<\/a><\/noindex> no Kea 1.6:<\/p>\n<ul>\n<li class=\"l\"> Implementado o backend de configura\u00e7\u00e3o (CB, Configuration Backend), permitindo gerenciar centralmente as configura\u00e7\u00f5es de v\u00e1rios servidores DHCPv4 e DHCPv6. O backend pode ser usado para armazenar a maioria das configura\u00e7\u00f5es do Kea, incluindo par\u00e2metros globais, informa\u00e7\u00f5es sobre redes compartilhadas, sub-redes, op\u00e7\u00f5es, pools e defini\u00e7\u00f5es de op\u00e7\u00f5es. Em vez de armazenar todas essas configura\u00e7\u00f5es em um arquivo de configura\u00e7\u00e3o local, elas agora podem ser colocadas em um banco de dados externo. \u00c9 poss\u00edvel definir, por meio do CB, n\u00e3o todas, mas apenas parte das configura\u00e7\u00f5es, sobrepondo par\u00e2metros de um banco de dados externo e arquivos de configura\u00e7\u00e3o locais (por exemplo, as configura\u00e7\u00f5es das interfaces de rede podem permanecer nos arquivos locais).\n<p>At\u00e9 o momento, apenas o MySQL \u00e9 suportado como banco de dados para o armazenamento de configura\u00e7\u00f5es (o MySQL, PostgreSQL e Cassandra podem ser usados para armazenar registros de atribui\u00e7\u00e3o de endere\u00e7os (leases), enquanto o MySQL e o PostgreSQL s\u00e3o usados para a reserva de hosts). A configura\u00e7\u00e3o no banco de dados pode ser alterada tanto por meio de acesso direto ao banco de dados quanto por meio de bibliotecas de camadas espec\u00edficas, que fornecem um conjunto padr\u00e3o de comandos para o gerenciamento da configura\u00e7\u00e3o, como adicionar e remover par\u00e2metros, vincula\u00e7\u00f5es, op\u00e7\u00f5es DHCP e sub-redes;<\/p>\n<li class=\"l\"> Foi adicionado um novo tipo de manipuladores 'DROP' (todos os pacotes relacionados \u00e0 classe DROP s\u00e3o imediatamente descartados), que pode ser utilizado para descartar tr\u00e1fego indesejado, como certos tipos de mensagens DHCP;\n<li class=\"l\"> Novos par\u00e2metros max-lease-time e min-lease-time foram adicionados, permitindo definir o tempo de vida da atribui\u00e7\u00e3o de um endere\u00e7o ao cliente (lease) n\u00e3o como um valor fixo, mas como um intervalo permitido;\n<li class=\"l\"> Melhorada a compatibilidade com dispositivos que n\u00e3o seguem totalmente os padr\u00f5es para DHCP. Para contornar problemas, o Kea agora envia informa\u00e7\u00f5es sobre o tipo de mensagem DHCPv4 no in\u00edcio da lista de op\u00e7\u00f5es, processa diferentes representa\u00e7\u00f5es de nomes de hosts, reconhece a transmiss\u00e3o de nomes de hosts vazios e permite a defini\u00e7\u00e3o de subop\u00e7\u00f5es com c\u00f3digos de 0 a 255;\n<li class=\"l\"> Para o daemon DDNS, foi adicionado um socket de controle separado, atrav\u00e9s do qual comandos podem ser transmitidos diretamente e altera\u00e7\u00f5es podem ser feitas na configura\u00e7\u00e3o. Os seguintes comandos s\u00e3o suportados: build-report, config-get, config-reload, config-set, config-test, config-write, list-commands, shutdown e version-get;\n<li class=\"l\"> Corrigidos <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/08\/29\/\">no aplicativo para Windows, que permitia ao usu\u00e1rio elevar seus privil\u00e9gios no sistema para administrador (a vulnerabilidade foi causada pela intera\u00e7\u00e3o inadequada entre o cliente GUI sem privil\u00e9gios e o servi\u00e7o de sistema).<\/a><\/noindex> (CVE-2019-6472, CVE-2019-6473, CVE-2019-6474), que podem ser usados para causar nega\u00e7\u00e3o de servi\u00e7o (provocar falha em manipuladores de servidor DHCPv4 e DHCPv6) ao enviar solicita\u00e7\u00f5es com op\u00e7\u00f5es e valores incorretos. O maior perigo \u00e9 representado pelo problema <noindex><a rel=\"nofollow\" href=\"https:\/\/kb.isc.org\/docs\/cve-2019-6474\">CVE-2019-6474<\/a><\/noindex>, que, se utilizada para vincula\u00e7\u00f5es de armazenamento memfile, resulta na impossibilidade de reiniciar o processo do servidor automaticamente, portanto, para restaurar a opera\u00e7\u00e3o, \u00e9 necess\u00e1ria a interven\u00e7\u00e3o manual do administrador (limpeza do banco de dados de vincula\u00e7\u00f5es).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51393\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c ISC \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0440\u0435\u043b\u0438\u0437 DHCP-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Kea 1.6.0, \u0438\u0434\u0443\u0449\u0435\u0433\u043e \u043d\u0430 \u0441\u043c\u0435\u043d\u0443 \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u043e\u043c\u0443 ISC DHCP. \u0418\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u0442\u0435\u043a\u0441\u0442\u044b \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Mozilla Public License (MPL) 2.0, \u0432\u043c\u0435\u0441\u0442\u043e \u0440\u0430\u043d\u0435\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0434\u043b\u044f ISC DHCP \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0438 ISC License. DHCP-\u0441\u0435\u0440\u0432\u0435\u0440 Kea \u043e\u0441\u043d\u043e\u0432\u0430\u043d \u043d\u0430 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f\u0445 BIND 10 \u0438 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043c\u043e\u0434\u0443\u043b\u044c\u043d\u043e\u0439 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b, \u043f\u043e\u0434\u0440\u0430\u0437\u0443\u043c\u0435\u0432\u0430\u044e\u0449\u0435\u0439 \u0440\u0430\u0437\u0431\u0438\u0435\u043d\u0438\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043d\u0430 \u0440\u0430\u0437\u043d\u044b\u0435 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u044b-\u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438. \u041f\u0440\u043e\u0434\u0443\u043a\u0442 \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28274,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-37675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c ISC \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0440\u0435\u043b\u0438\u0437 DHCP-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Kea 1.6.0, \u0438\u0434\u0443\u0449\u0435\u0433\u043e.\" \/>\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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