Proxy Description
Firebox Vclass User Guide 239
The HTTP proxy sits between the sending Web server and
your receiving Web client, much like a standard proxy
server. It processes the HTTP line-by-line for any poten-
tially harmful content before passing it to the internal Web
client. It also acts as a buffer between your Web server and
potentially harmful Web clients, enforcing HTTP RFC com-
pliance for GET and POST operations.
SMTP Proxy
The SMTP proxy can be used to limit or prevent potentially
harmful email content. The proxy scans SMTP messages
for a number of filtered parameters, and compares them
against the configuration and rulesets specified in the
proxy action. Email messages containing suspect attach-
ments can be stripped of their attachments and then sent to
the intended recipient, denied entirely, or Blocked (denied,
with the Sender IP added to the Blocked Sites List).
The Outbound SMTP proxy can be used to prevent mali-
cious SMTP messages that originate within your network
from passing through the Vclass appliance, and out to the
internet or WAN. The Inbound SMTP proxy is used to pre-
vent malicious messages or code from reaching destina-
tions within your network.
Rules and Rulesets
Proxy actions are configured using a set of general parame-
ters, and several sets of rules.
Rules
• Rules specify a type of content, pattern, or expression
that the proxy action should identify.
• Rules specify actions (allow, strip or strip, drop, or
Block) that are taken when content matches a rule.
• Rules allow for independent alarm notification.
• Rules allow for independent logging.
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