RANONYMIZE.CONF(1)RANONYMIZE.CONF(1)NAME
ranonymize.conf - ranonymize(1) configuration file.
COPYRIGHT
Copyright (c) 2000-2008 QoSient. All rights reserved.
SYNOPSIS
ranonymize.conf
DESCRIPTION
This configuration file provides the ability to specify options for
argus data anoymization.
OPTIONS
The anonymization clients have a small number of options for control‐
ling specific aspects of the anonymization function and its output.
Timestamps, Reference and Sequence Numbers
Ranonymize anonymizes various fields in Argus records, such as the net‐
work addresses, protocol specific port numbers, timestamps, transaction
reference numbers, and the sequence numbers.
For some fields, specifically the timestamps, transaction reference
numbers and the sequence numbers, which are generally monotonically
increasing counters, a good anonymization technique is to shift the
values by a constant, so that the sequential relationships between val‐
ues is preserved.
The configuration provides some flexibility here, so that the user can
control fixed offset shifting anonymization. The constant value can be
generated by the anonymization client at "random", which is the default
behavior, or the user can provide a "fixed:x", where x is the fixed
offset. Of course, the keyword "none" can be used to turn off the
default anonymization for these values.
RANON_TRANSREFNUM_OFFSET=random
RANON_SEQNUM_OFFSET=random
RANON_TIME_SEC_OFFSET=random
RANON_TIME_USEC_OFFSET=random
Ethernet Address Vendor Codes
When anonymizing ethernet addresses, ranonymize has the option to pre‐
serve the vendor portion, if desired. This allows analytical programs
to differentiate anonymized data by vendor type. This feature is
turned off by default.
RANON_PRESERVE_ETHERNET_VENDOR=no
Broadcast Addresses
Ranonymize has the option to preserve the semantic that an address is a
broadcast address. This is very important when doing flow analysis for
either operational or performance managment tasks, using anonymized
data.
RANON_PRESERVE_BROADCAST_ADDRESS=yes
IPv4 Address Anonymization
IPv4 address are composed of two parts, a network part and a host part.
Because the addressing strategy of a site may have integrated semantics
that would want to be retained in the anonymized addresses, IPv4
address anonymization involves specifying a one-to-one translation ta‐
ble for both the network and host address spaces in an IPv4 address.
Once a new network address has been allocated, every occurence of that
network address will be substituted in the anonymizers output stream.
The host address space is anonymized in an independent but similar
fashion.
Ranonymize allows you to specify the type of anonymization method used
in a number of categories. For network and host address conversion,
ranonymize can support "sequential", "random" or "no" anonymization.
Sequential anonymization involves allocating new addresses in a mono‐
tonically increasing fashion on a first come first serve basis. Random
anonymization allocates random addresses from the working pool of
addresses, and "no" anonymization preserves the address type, whether
its network, host or both.
The default working pool of network addresses contains only non-
routable addresses, and starts with 10.0.0.0. All anonymized addresses
are treated as Class C network addresses, in order to conserve the
anonymization allocation demands.
As an example, if the first Argus record contained the addresses
128.64.2.4 and 132.243.2.87 as the source and destination, sequential
anonymization would generate the addresses 10.0.0.1 and 10.0.1.1 as the
new source and destination addresses. This is because, the two
addresses have differing network parts, 128.64.2 and 132.243.2, these
would be allocated 10.0.0 and 10.0.1 respectively (sequential alloca‐
tion). Because these are the first hosts to be allocated, the host
parts are both 1.
Random anonymization could generate 10.24.31.203 and 10.1.34.18 as pos‐
sible addresses, as both the Class C network address would be allocated
randomly from the 10 network space, and the host address part would be
allocated randomly from the possible host addresses.
Sequential randomization uses the least amount of memory and minimizes
anonymization processing time, while random provides better address
scrambling.
Implemenation note: currently only supporting sequential
RANON_NET_ANONYMIZATION=sequential
RANON_HOST_ANONYMIZATION=sequential
Address Hierarchy
Ranonymize has the option to preserve the network address hierarchy at
various levels of granularity. This allows you to preserve the
addressing relationships between addresses. The options are "cidr",
"class", "subnet" and "no".
Class network adddress heirarchy preservation, causes ranonymize() to
allocate new network addresses base on the address class. All CLASSA
network addresses will be allocated new addresses from the Class A net‐
work pool. Network addresses will be allocated as 24 bit CIDR
addresses, in that the first 24 bits will map to a unique 24 network
address, and host addresses will be allocated from the 254 address pool
(0 and 255 can be preserved, see below).
RANON_PRESERVE_NET_ADDRESS_HIERARCHY=cidr
Specific Network Address Aliasing
Ranonymize can be configured to perform specific network address trans‐
lation. These must be specified as 24 bit CIDR addresses. RANON_PRE‐
SERVE_NET_ADDRESS_HIERARCHY must be set to "cidr", for this feature to
work.
Examples would be:
RANON_SPECIFY_NET_TRANSLATION=192.168.0.0::128.2.134.0
RANON_SPECIFY_NET_TRANSLATION=64.12.0.0::134.5.0.0
RANON_SPECIFY_NET_TRANSLATION=128.2.0.0::200.200.0.0
Specific Host Address Aliasing
Ranonymize can be configured to perform specific host address transla‐
tion. These addresses are allocated prior to reading any data, and are
removed from the potential network address pool, regardless of the
anonymization strategy. Feel free to list as many addresses that you
would like.
Examples would be:
RANON_SPECIFY_HOST_TRANSLATION=192.168.0.64::128.2.34.5
Transport SAP Aliasing
Ranonymize can be configured to preserve specific ranges of port num‐
bers. For convenience, ranonymize() can be configured to preserve the
IANA well known port allocation range (0-1023), the registered ports
(1024-49151) and/or the private port range (49152 - 65535). Also,
ranonymize() can be configured to preserve specific port numbers. These
numbers are independent of protocol type, so if port 23461 is to be
preserved, it will be preserved for both tcp and udp based flows.
RANON_PRESERVE_WELLKNOWN_PORT_NUMS=yes
RANON_PRESERVE_REGISTERED_PORT_NUMS=no
RANON_PRESERVE_PRIVATE_PORT_NUMS=no
SEE ALSOranonymize(1)
14 November 2001 RANONYMIZE.CONF(1)
