Learning All About Router

CALEA features included in RouterOS

Multiple subject/multiple destination packet interception and streaming in following formats:

• Call Content Connection (CCC) Interface according to PKT-SP-ES-DCI-I01-060914 (PacketCable 2.0 PacketCable Electronic Surveillance Delivery Function to Collection Function Interface Specification)
• Call Content Connection (CCC) Interface according to ANSI/SCTE 24-13 2006 (IPCalblecom Electronic Surveillance Standard) that is approved method for Communication Content delivery to LEA according to ATIS-1000013.2007 (Lawfully Authorized Electronic Surveillance For Internet Access and Services)
• TZSP format - for reception with 'Ethereal', tcpdump, trafr (sniffer stream reader for linux) - http://www.mikrotik.com/download.html

CALEA-server package

• accepts multiple CCC streams (identified by destination port/source address/case id)
• stores communication content according to "IP Network Access Intercept Requirements and Method"(FBI-WISPA draft) specified "full content" intercept requirements (without out-of-band events)
• stores communication content of multiple subjects/cases
• stores communication content in libpcap format
• new libpcap file based on different conditions (interval/size/packet count)
• generates hash for each pcap file (md5/sha1/sha256)

Calea user

Calea provided options are available only for specific RouterOS user, as Calea server configuration as "tap" configuration. Specific user should have 'sniff' policy enabled at RouterOS user configuration,

/ user group set 0 policy=sniff

sniff policy is enabled by default for "full" and "write" user groups.

Intercepting Packet Flow

The IP Firewall and Interface Bridge now have one additional section,

• firewall section to intercept packets that are going trough firewall

/ ip firewall calea

• bridge section to intercept packets that are going trough bridge

/ interface bridge calea

Firewall and Bridge Calea menus contain same actions and matchers as "ip firewall filter" and "interface bridge filter", new avalailble actions:

• sniff - generates a tzsp stream that can be directed to any Wireshark (Ethereal) server
• sniff-pc - generates a Packet Cable stream that can be directed to a MikroTik RouterOS system with the calea package installed

By selecting either action, the following options will be available:

• sniff-id (Packet Cable protocol only) - packet stream case ID, that can be used to differentiate between separate traffic sets (e.g., between different users; or between client traffic and server traffic)
• sniff-target - IP address of the data retention server
• sniff-target-port - UDP port that the data retention server is listening on

Data Retention Server

The calea package provides an additional tool menu - /tool calea, that allows to save certain incoming data streams to a file. The server will create separate files for each packet stream (one data file and one hash file, if configured). The files will not grow indefinitely, but rather util a certain limit, after which a new set of files will be created for that stream. The limit is specified in size and extent of time, whichever is reached first.

Add a rule with the following properties:

• case-id - case ID set by the intercepting router
• case-name - case name is set on server to specify the folder, where intercepted data is stored
• intercept-ip - IP address of the intercepting router (IP address to receive the stream from)
• intercept-port - UDP port to listen on (port to receive the stream on)
• action - storage format (only pcap for now)
• pcap-file-stop-interval - maximal interval between creating new fileset, if size limit is not reached earlier
• pcap-file-stop-size - maximal filesize, in KiB
• pcap-file-stop-count - maximal packet count
• pcap-file-hash-method - hashing algorithm (md5, sha1 or sha256) for the data file (saved once the data file is completed and closed); no file is created if set to none

Calea Server/Client Configuration Example

let's assume the particular network configuration, we need to intercept data from 192.168.0.10 Wireless Client and send it to the Calea Server located on Local Network:

[edit] Client Configuration for the Intercept

Wireless Client is connected to Access Point, data interception has to be performed on Access Point for the particular network design.

• We have requirement to capture all data from the user Wireless Client with IP address of 192.168.0.10 We have to add two rules to make the interception,

/ ip firewall calea add action=sniff-pc chain=forward sniff-id=100 sniff-target=10.9.1.250 sniff-target-port=5555 src-address=192.168.0.10
/ ip firewall calea add action=sniff-pc chain=forward sniff-id=100 sniff-target=10.9.1.250 sniff-target-port=5555 dst-address=192.168.0.10

All traffic going trough the router for specified src/dst addresses is intercepted and sent to Calea Server (sniff-target) with sniff-id=100

• Calea package is not required for intercepting host.

Calea Server Configuration

• Calea package is required for server.
• One rule is required to accept the data from the Access Point to receive all intercepted traffic from the Access Point,

/ tool calea add action=pcap intercept-port=5555 case-id=100 intercept-ip=192.168.0.254

Intercept-port and case-id should be equal on server and client side, intercept-ip is IP address of the intercepting router (Access Point).

• Calea server received information is available under 'file' menu.