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Adding query for NSG rule #4

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Adding query for NSG rule #4

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Adding query related to NSG rule
sayghosh Dec 2, 2019
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23 changes: 23 additions & 0 deletions src/resource-graph/queries/NSGQueries/NSGRulesAllowingPublicIPs.txt
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/*
* The below query targets to filter all the NSG rules which is configured to allow public IPs.
* The data source for the below query is Azure Resource Graph RP.
*/

Resources
| where type =~ "microsoft.network/networksecuritygroups"
| project nsgRules = parse_json(parse_json(properties).securityRules), NSG = name, subscriptionId, resourceGroup
| mvexpand nsgRule = nsgRules
| where nsgRule.properties.access =~ "allow" and nsgRule.properties.priority < 65000
| project sourceAddressPrefix = nsgRule.properties.sourceAddressPrefix, sourceAddressPrefixes = nsgRule.properties.sourceAddressPrefixes,
destinationAddressPrefix = nsgRule.properties.destinationAddressPrefix, destinationAddressPrefixes = nsgRule.properties.destinationAddressPrefixes, NSG, NSGRule = tostring(nsgRule.name), subscriptionId, resourceGroup
| project sourceIPs = iif(array_length(sourceAddressPrefixes) == 0, pack_array(sourceAddressPrefix), sourceAddressPrefixes),
destIPs = iif(array_length(destinationAddressPrefixes) == 0, pack_array(destinationAddressPrefix), destinationAddressPrefixes), NSG, NSGRule, subscriptionId, resourceGroup
| mvexpand ipRange = array_concat(sourceIPs, destIPs) to typeof(string)
| extend ipRangeSplit = split(ipRange, "/")
| extend ipRangeStart = parse_ipv4(tostring(ipRangeSplit[0])),
ipRangeEnd = iif(array_length(ipRangeSplit) == 2, tolong(parse_ipv4(tostring(ipRangeSplit[0])) + pow(2, 32 - toint(ipRangeSplit[1])) - 1), parse_ipv4(tostring(ipRangeSplit[0])))
| extend RuleContainsOnlyPrivateIpOrTags = iif((ipRangeStart >= parse_ipv4("10.0.0.0") and ipRangeEnd <= parse_ipv4("10.255.255.255"))
or (ipRangeStart >= parse_ipv4("172.16.0.0") and ipRangeEnd <= parse_ipv4("172.31.255.255"))
or (ipRangeStart >= parse_ipv4("192.168.0.0") and ipRangeEnd <= parse_ipv4("192.168.255.255")), true, ipRange != "*" and array_length(ipRangeSplit) == 1 and isnull(parse_ipv4(ipRange)))
| where RuleContainsOnlyPrivateIpOrTags == false
| summarize violatingIpRanges = makeset(ipRange) by NSG, NSGRule, subscriptionId, resourceGroup