Filtragem de Email com Red Hat Linux - PowerPoint PPT Presentation

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Filtragem de Email com Red Hat Linux

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Filtragem de Email com Red Hat Linux – PowerPoint PPT presentation

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Title: Filtragem de Email com Red Hat Linux


1
Filtragem de Email com Red Hat
Linux Implementações Práticas e Apresentação de
Laboratórios
Ruben Oliveira RHCE RHCX MCSE MCITP
2
  • Postfix Mail Server / GW Filter
  • Mailscanner
  • SpamAssassin
  • Mailwatch
  • Webmin/Usermin
  • Dovecot
  • Apresentação de Laboratórios

3
  • Postfix Mail Server / GW Filter

4
  • Postfix Mail Server / GW Filter

5
  • Postfix
  • main.cf
  • multiple domain
  • mail relaying
  • sasl / tls

6
  • MailScanner
  • www.mailscanner.info
  • A Free Anti-Virus and Anti-Spam Filter
  • Protecting over 1 billion e-mails every day
  • Over 1 million downloads
  • Perl based
  • Instalação simples
  • Compatível com Sendmail/Postfix/Exim,etc
  • como alternativas amavisd-new

7
  • Spam Scanning
  • Most of the spam scanning is done with the help
    of SpamAssassin
  • DNS blacklists
  • over 850 heuristic rules
  • Bayesian probability system
  • Distributed network-based checks such as
  • Razor, DCC, Pyzor which track the frequency of
    messages around the world to identify spam

8
  • Virus Scanning
  • Scans all e-mail passing through it for viruses
    using any combination of the supported anti-virus
    engines
  • Many sites run 2 or 3 different engines for
    better coverage and resistance against brand new
    viruses
  • Anti-Virus Engines 20 are supported, including
    all the major market leaders
  • ClamAV is free and has greatly improved over the
    past year

9
  • Virus Handling
  • Attachments containing viruses or other security
    problems are removed
  • All safe content is delivered untouched
  • Recipients and senders may get a warning
    explaining what happened and who they should
    contact for help
  • System admin notified of basic details of message
    and what viruses were found

10
  • Attachment Filenames
  • Allows/denies attachments based on filename and
    file content, providing implementation of any
    email security policy.
  • Easily used to block attachments which are
    common ways of disguising viruses,
    e.g. ReadMe.doc.exe
  • These can be varied for different users.

11
  • Highly Configurable
  • Virtually all configuration parameters can be
    set using fixed values, rulesets or Custom
    Functions
  • Rulesets allow different values for any users or
    domains you specify
  • Reports are supplied in 15 languages
  • Language can be different for different domains
    and users

12
  • Rulesets
  • Archive Mail /etc/MailScanner/rules/arch.rules
    -)?
  • From joao_at_dominio.pt joana_at_dominio2.pt
  • From - Matches when the message is from a
    matching address
  • To - Matches when the message is to a
    matching address
  • FromOrTo - Matches when the message is from or
    to a matching address
  • user_at_sub.domain.com Individual address
  • _at_domain.com Any user at 1 specific
    domain
  • 192.168.21.0/24 Any SMTP client IP
    address in this network
  • _at_ Default value
  • default Default value
  • Destination email address / directorio com ou sem
    datas appended / ficheiro mbox

13
  • Custom Functions
  • These allow implementation of any
    other configuration model you choose, including
    external databases of user options
  • Many useful examples are provided
  • Minimal Perl knowledge needed

14
  • Hash-Sharing Systems
  • Send a checksum of a message to an online
    database of spam.
  • "Has anyone reported this as spam?". The online
    database can report back "yes", allowing your
    mail system to raise the spam score for that
    message.
  • Pyzor Razor DCC

15
  • Mailwatch
  • MailWatch for MailScanner is a web-based
    front-end to MailScanner written in PHP, MySQL
  • Load Average and Todays Totals for Messages,
    Spam, Viruses and Blocked Content.
  • Colour-coded display of recently processed mail.
  • Drill-down onto each message to see detailed
    information.
  • Quarantine management allows you to release,
    delete or run sa-learn across any quarantined
    messages.
  • Reports with customisable filters and graphs

16
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17
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18
  • Webmin / Usermin
  • Gestão e Utilização do servidor via https

19
  • Dovecot
  • Dovecot is an open source IMAP and POP3 server
    for Linux
  • security primarily in mind.
  • It's fast, simple to set up, requires no special
    administration and it uses very little memory.

20
  • Laboratórios
  • Utilização de Máquinas Virtuais
  • Instalação de um servidor de email com filtragem
    de spam e virus, além de webmail e gestão via
    http

21
Obrigado Perguntas e Respostas ruben.oliveira_at_r
umos.pt
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