April 2025
Intermediate to advanced
248 pages
7h 6m
Portuguese (Portugal, Brazil)
Content preview from Administração prática de sistemas Linux
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Capítulo 13. Proteger o teu sistema
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Segurança do sistema é a aplicação de configurações, software, políticas, regras e práticas recomendadas a um sistema (seja ele novo ou antigo) para que o sistema funcione sem tempo de inatividade significativo devido a violações e comprometimentos de segurança. Como administrador de sistemas, a segurança é a tua tarefa mais importante e que consome mais tempo.
Este capítulo concentra-se na prevenção de problemas de segurança. A descoberta e a mitigação são abordadas brevemente. Aprenderás a proteger tanto os sistemas recém-implantados como os que já estão em funcionamento há anos. Nenhum tratamento único é abrangente porque novas ameaças e vulnerabilidades surgem diariamente. Aprenderá a aplicar configurações básicas de segurança aos seus sistemas Linux. Uma vez que muitas empresas de grande dimensão têm as suas próprias normas, as definições de segurança que recomendo são um bom ponto de partida, mas deves sempre cumprir os protocolos e políticas de segurança da empresa.
Proteger a conta raiz
A conta de utilizador root é a conta mais poderosa em todos os sistemas Linux e tens de proteger o acesso a ela. Se alguém comprometer esta conta, pode bloquear-te, destruir o sistema, roubar dados, ou manter o controlo da conta e usá-la para aceder e comprometer outros sistemas dentro da tua rede. Nunca escrevas ou partilhes a palavra-passe ...
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