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Chapter 1: Overview of Content Policy Language
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<Proxy>
client.address=!corporate_subnet deny ; filter out strangers
socks.authenticate(MyRealm) ; this happens earlier than the category test
<Proxy>
; user names be displayed in the access log for the denied requests
category=Gambling exception(content_filter_denied)
Note that this only works for SOCKS authenticated users.
Installing Policy
Policy is installed by installing one of the four policy files (VPM, Local, Central or Forward). Installing
one new file causes the most recent versions of the other three files to be loaded, the contents
concatenated in the order specified by the current configuration, and the resulting complete policy
compiled.
If any compilation errors are detected, the new policy file is not installed and the policy in effect is
unchanged.
Refer to Chapter 12, “Advanced Policy,” of the ProxySG Configuration and Management Guide for
specific instructions on installing a policy file.
CPL General Use Characters and Formatting
The following characters and formatting have significance within policy files in general, outside of the
arguments used in condition expressions, the values used in property statements, and the arguments
used in actions.
Character Example Significance
Semicolon (;) ; Comment
<Proxy> ; Comment
Used either inline or at the beginning of a
line to introduce text to be ignored during
policy evaluation. Commonly used to
provide comments.
Newline deny server_url.scheme=mms deny
server_url.domain=xyz.com
CPL expects most constructs (layers,
sections, rules, definitions) to begin on a new
line. When not preceded by a line
continuation character, a newline terminates
a layer header, section header, the current
rule, clause within a defined condition, or
action within an action definition.
Line Continuation \ A line continuation character indicates that
the current line is part of the previous line.
Whitespace < proxy >
weekday = ( 3 || 7 ) deny
Used to enhance readability. Whitespace can
be inserted between tokens, as shown in this
example, without affecting processing. In
addition, quoted strings can include
whitespace. However, numeric ranges, such
as weekday = 1..7, cannot contain
whitespace.
Angle brackets (< >) <Proxy> Used to mark layer headings.
Square brackets ([ ]) [Rule] Used to mark section names.