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canary-receiver.js
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canary-receiver.js
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addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request))
})
// Change this to a unique value -- this will become the authentication header field "auth" string for the Canary generic webhook to use.
// Note: Be careful not to use the " or $ character in this authentication string
const authString = "canhasauthenticated"
// Syslog messages formatted to RFC 3164 (BSD)
// Change true to false to disable the Syslog parse/store routine.
const EnableSyslog = true
// Ensures the KV records purge after 7 days if they have not been picked up for syslog processing.
const SyslogBufferTTL = 604800
// Change "BlockListCanary" to the name of a Canary you would like contributing to a IP blocklist. Leave value as-is to disable.
const MyCanary = "BlockListCanary"
// Auto-purge blocked IP addresses after 6 months.
const IPBlocklistTTL = 15552000
// Have an abuseipdb.com account? Report the incident!
const abuseIPDBURL = "https://api.abuseipdb.com/api/v2/report?"
// Edit this value to your account's authentication key value:
const abuseIPDBKey = "yourkeyhere"
const Months = ["zero", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
async function handleRequest(request) {
// check we have a POST request
if (request.method !== "POST") {
return new Response(``, {status: 200})
}
try {
let Auth = request.headers.get("auth")
// check to make sure the request is authenticated with a secret
if (Auth !== authString){
return new Response(``, {status: 200})
}
else {
// authentication received, process event
const data = await request.json()
let Timestamp = data.Timestamp
let Payload = "n/a"
let MaliciousEvent = 1
let SyslogPriority = "<113>"
switch (true){
case /Scan/.test(data.Description):
SyslogPriority = "<116>";
if (abuseIPDBKey !== "yourkeyhere") {
let CurrentDate = new Date()
let ReportDate = CurrentDate.toISOString().split('T')[0]
let EventDesc = encodeURI(data.Description)
let AbuseIPRequest = `${abuseIPDBURL}ip=${MaliciousIP}&categories=14&comment=${EventDesc}%20${ReportDate}&key=${abuseIPDBKey}`
let RequestData = {
method: "POST",
headers: {
"content-type": "text/html;charset=UTF-8",
},
};
fetch(AbuseIPRequest, RequestData)
}
break;
case /Custom/.test(data.Description):
SyslogPriority = "<116>";
if (abuseIPDBKey !== "yourkeyhere") {
let CurrentDate = new Date()
let ReportDate = CurrentDate.toISOString().split('T')[0]
let EventDesc = encodeURI(data.Description)
let AbuseIPRequest = `${abuseIPDBURL}ip=${MaliciousIP}&categories=14&comment=${EventDesc}%20${ReportDate}&key=${abuseIPDBKey}`
let RequestData = {
method: "POST",
headers: {
"content-type": "text/html;charset=UTF-8",
},
};
fetch(AbuseIPRequest, RequestData)
}
break;
case /Load/.test(data.Description):
SyslogPriority = "<116>";
if (abuseIPDBKey !== "yourkeyhere") {
let CurrentDate = new Date()
let ReportDate = CurrentDate.toISOString().split('T')[0]
let EventDesc = encodeURI(data.Description)
let AbuseIPRequest = `${abuseIPDBURL}ip=${MaliciousIP}&categories=14&comment=${EventDesc}%20${ReportDate}&key=${abuseIPDBKey}`
let RequestData = {
method: "POST",
headers: {
"content-type": "text/html;charset=UTF-8",
},
};
fetch(AbuseIPRequest, RequestData)
}
break;
case /Settings Changed/.test(data.Description):
SyslogPriority = "<117>";
MaliciousEvent = 0;
break;
case /Disconnected/.test(data.Description):
SyslogPriority = "<114>";
MaliciousEvent = 0;
break;
case /Reconnected/.test(data.Description):
SyslogPriority = "<118>";
MaliciousEvent = 0;
break;
case /Dummy/.test(data.Description):
SyslogPriority = "<119>";
MaliciousEvent = 0;
break;
default:
if (abuseIPDBKey !== "yourkeyhere") {
let CurrentDate = new Date()
let ReportDate = CurrentDate.toISOString().split('T')[0]
let EventDesc = encodeURI(data.Description)
let AbuseIPRequest = `${abuseIPDBURL}ip=${MaliciousIP}&categories=15&comment=${EventDesc}%20${ReportDate}&key=${abuseIPDBKey}`
let RequestData = {
method: "POST",
headers: {
"content-type": "text/html;charset=UTF-8",
},
};
fetch(AbuseIPRequest, RequestData)
}
break;
}
if (EnableSyslog) {
let SyslogSplitDate = Timestamp.split("-")
let SyslogSplitTime = SyslogSplitDate[2].split(" ")
let MonthIndex = Number(SyslogSplitDate[1])
let SyslogMonth = Months[MonthIndex]
SyslogSplitTime[0] = SyslogSplitTime[0].replace("0"," ")
Payload = `${SyslogPriority} ${SyslogMonth} ${SyslogSplitTime[0]} ${SyslogSplitDate[0]} ${SyslogSplitTime[1]} ${data.CanaryName}(${data.CanaryLocation}) CanaryEvent: ${data.Intro} | Desc: ${data.Description} | Port: ${data.CanaryPort} | RemoteIP: ${data.SourceIP} | PTR: ${data.ReverseDNS}`
// Store in KV store (Key-Value store)
await canaryevents.put(Payload, Timestamp, {expirationTtl: SyslogBufferTTL})
}
if (data.CanaryName == MyCanary && MaliciousEvent == 1) {
const MaliciousIP = data.SourceIP
// Store in KV store (Key-Value store)
await canaryblocks.put(MaliciousIP, Timestamp, {expirationTtl: IPBlocklistTTL})
return new Response(
`Marked IP: ${MaliciousIP} and Stored Event: ${Payload}`,
{status: 200}
)
}
else {
return new Response(
`Stored Event: ${Payload}`,
{status: 200}
)
}
}
} catch (e) {
/* use `Error: ${e}` response string to debug */
return new Response(``, {status: 200})
}
}