1A Random IP reputation service acting as a Stream Processing Offload Agent 2-------------------------------------------------------------------------- 3 4This is a very simple service that implement a "random" ip reputation 5service. It will return random scores for all checked IP addresses. It only 6shows you how to implement a ip reputation service or such kind of services 7using the SPOE. 8 9 10 Start the service 11--------------------- 12 13After you have compiled it, to start the service, you just need to use "spoa" 14binary: 15 16 $> ./spoa -h 17 Usage: ./spoa [-h] [-d] [-p <port>] [-n <num-workers>] 18 -h Print this message 19 -d Enable the debug mode 20 -p <port> Specify the port to listen on (default: 12345) 21 -n <num-workers> Specify the number of workers (default: 5) 22 23Note: A worker is a thread. 24 25 26 Configure a SPOE to use the service 27--------------------------------------- 28 29All information about SPOE configuration can be found in "doc/SPOE.txt". Here is 30the configuration template to use for your SPOE: 31 32 [ip-reputation] 33 34 spoe-agent iprep-agent 35 messages check-client-ip 36 37 option var-prefix iprep 38 39 timeout hello 100ms 40 timeout idle 30s 41 timeout processing 15ms 42 43 use-backend iprep-backend 44 45 spoe-message check-client-ip 46 args src 47 event on-client-session 48 49 50The engine is in the scope "ip-reputation". So to enable it, you must set the 51following line in a frontend/listener section: 52 53 frontend my-front 54 ... 55 filter spoe engine ip-reputation config /path/spoe-ip-reputation.conf 56 .... 57 58where "/path/spoe-ip-reputation.conf" is the path to your SPOE configuration 59file. The engine name is important here, it must be the same than the one used 60in the SPOE configuration file. 61 62IMPORTANT NOTE: 63 Because we want to send a message on the "on-client-session" event, this 64 SPOE must be attached to a proxy with the frontend capability. If it is 65 declared in a backend section, it will have no effet. 66 67 68Because, in SPOE configuration file, we declare to use the backend 69"iprep-backend" to communicate with the service, you must define it in HAProxy 70configuration. For example: 71 72 backend iprep-backend 73 mode tcp 74 timeout server 1m 75 server iprep-srv 127.0.0.1:12345 check maxconn 5 76 77 78In reply to the "check-client-ip" message, this service will set the variable 79"ip_score" for the session, an integer between 0 and 100. If unchanged, the 80variable prefix is "iprep". So the full variable name will be 81"sess.iprep.ip_score". 82 83You can use it in ACLs to experiment the SPOE feature. For example: 84 85 tcp-request content reject if { var(sess.iprep.ip_score) -m int lt 20 } 86 87With this rule, all IP address with a score lower than 20 will be rejected 88(Remember, this score is random). 89