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LoginMonitor.ps1
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LoginMonitor.ps1
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<#
Gets DB connection string parameters from config.xml
#>
function Get-DBConnectionString
{
[cmdletbinding()]
$config = "$PSScriptRoot\config.xml"
$xml = [xml](Get-Content $config)
$Server = $xml.SelectSingleNode("//Server[1]").FirstChild.Value
$ConnectionString = "server=$($Server);database=LoginMonitor;trusted_connection=true;"
return $ConnectionString
}
function Log-GeoIP
{
[cmdletbinding()]
Param
(
[parameter(position = 0, Mandatory=$true)]
[System.Data.SQLClient.SQLConnection]
$Connection,
[parameter(position = 1, Mandatory=$true)]
[string]
$IPAddress
)
$url = "http://api.geoiplookup.net/?query=" + $IPAddress
$http_Request = [System.Net.WebClient]::new()
try
{
[xml] $Result = $http_Request.DownloadString($url)
$Hst = $Result.ip.results.result.host
$ISP = $Result.ip.results.result.isp
$City = $Result.ip.results.result.city
$CountryCode = $Result.ip.results.result.countrycode
$CountryName = $Result.ip.results.result.countryname
$Latitude = $Result.ip.results.result.latitude
$Longitude = $Result.ip.results.result.longitude
$Command = [System.Data.SqlClient.SqlCommand]::new('dbo.InsertGeoIP', $Connection)
$Command.CommandType = [System.Data.CommandType]::StoredProcedure
try
{
$null = $Command.Parameters.AddWithValue('@IPAddress', $IPAddress)
$null = $Command.Parameters.AddWithValue('@Host', $Hst)
$null = $Command.Parameters.AddWithValue('@ISP', $ISP)
$null = $Command.Parameters.AddWithValue('@City', $City)
$null = $Command.Parameters.AddWithValue('@CountryCode', $CountryCode)
$null = $Command.Parameters.AddWithValue('@CountryName', $CountryName)
$null = $Command.Parameters.AddWithValue('@Latitude', $Latitude)
$null = $Command.Parameters.AddWithValue('@Longitude', $Longitude)
$Command.ExecuteNonQuery()
}
finally
{
$Command.Dispose()
}
}
catch
{
return
}
finally
{
$http_Request.Dispose()
}
}
function Add-BlockRule
{
[cmdletbinding()]
param
(
[parameter(position = 0, Mandatory=$true)]
[string]
$IPAddress,
[parameter(position = 1, Mandatory=$true)]
[string]
$RuleName,
[parameter(position = 2, Mandatory=$true)]
[string]
$RuleGroup
)
$config = "$PSScriptRoot\config.xml"
$xml = [xml](Get-Content $config)
[int] $UseIPSec = $xml.SelectSingleNode("//UseIPSec[1]").FirstChild.Value
if($UseIPSec -eq 1)
{
# A filter list is created for each IP because netsh apparently has a bug when running a command to delete
# an IP address from an existing list, e.g.:
# netsh ipsec static delete filter filterlist="SQL Server Login Monitor" srcaddr=123.123.123.123 dstaddr=any
# always returns ERR IPsec[05050] : Filter with the specified spec does not exist in FilterList with name 'SQL Server Login Monitor'.
# This apparently worked in previous versions of Windows, it doesn't work in Windows Server 2016/Windows 10 that I use for testing.
# Therefore creating a filter list for each IP is the only way around this. From testing this doesn't appear to affect performance
# when the number of blocked IPs approaches ~1000. I haven't tested it beyond this.
netsh ipsec static add filter filterlist=$RuleName srcaddr=$IPAddress dstaddr=me
netsh ipsec static add rule name=$RuleName policy=$RuleGroup filterlist=$RuleName filteraction=$RuleGroup
}
else
{
# From testing it appears this is the fastest method for creating the firewall rule so the client is blocked
# as quickly as possible. The rule is first created using netsh, but because netsh does not allow for specifying
# the firewall group, the rule is retreived via COM after creation to set the group (just to keep the rules organized
# in the windows firewall UI).
netsh advfirewall firewall add rule name=$RuleName dir=in interface=any action=block remoteip=$IPAddress
Get-NetFirewallRule -DisplayName $RuleName | ForEach { $_.Group = $RuleGroup; Set-NetFirewallRule -InputObject $_ }
}
}
function Delete-BlockRule
{
[cmdletbinding()]
param
(
[parameter(position = 0, Mandatory=$true)]
[string]
$RuleName,
[parameter(position = 1, Mandatory=$true)]
[string]
$RuleGroup
)
$config = "$PSScriptRoot\config.xml"
$xml = [xml](Get-Content $config)
[int] $UseIPSec = $xml.SelectSingleNode("//UseIPSec[1]").FirstChild.Value
if($UseIPSec -eq 1)
{
netsh ipsec static delete rule name=$RuleName policy=$RuleGroup
netsh ipsec static delete filterlist name=$RuleName
}
else
{
netsh advfirewall firewall delete rule name=$RuleName dir=in
}
}
function Create-IPSecPolicy
{
[cmdletbinding()]
$RuleGroup = 'SQL Server Login Monitor'
$Desc = 'SQL Server Login Monitor block list'
netsh ipsec static add filteraction name=$RuleGroup action=block
netsh ipsec static add policy name=$RuleGroup description=$Desc
netsh ipsec static set policy name=$RuleGroup assign=y
}
<#
Used to extract event data passed from task scheduler to get user ID, error message and client IP address
#>
function Extract-EventData
{
[cmdletbinding()]
param
(
[parameter(position = 0, Mandatory=$true)]
[int]
$EventID,
[parameter(position = 1, Mandatory=$true)]
[string]
$EventData
)
[string] $UserID = ''
[string] $Message = ''
[string] $IPAddress = ''
$EventDataArray = $EventData.Split(',')
if($EventID -eq 18456)
{
if($EventDataArray.Length -gt 0)
{
$UserID = $EventDataArray[0].Trim()
}
if($EventDataArray.Length -gt 1)
{
$Message = $EventDataArray[1].Trim()
}
}# For some reason the event description is not provided for these events
elseif($EventID -eq 17828)
{
$Message = 'The prelogin packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library.'
}
elseif($EventID -eq 17832)
{
$Message = 'The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library.'
}
elseif($EventID -eq 17836)
{
$Message = 'Length specified in network packet payload did not match number of bytes read; the connection has been closed. Please contact the vendor of the client library.'
}
else
{
return
}
# Use Regex to extract client IP address
$Regex = [Regex]::new('(?<=\[CLIENT: )(.*)(?=\])')
foreach ($data in $EventDataArray)
{
$Match = $Regex.Match($data)
if ($Match.Success)
{
$IPAddress = $Match.Value.Trim()
break
}
}
$UserID
$Message
$IPAddress
return
}
<#
Logs a failed login to the database and blocks the client if needed.
#>
function Log-FailedLogin
{
[cmdletbinding()]
Param
(
[parameter(position = 0, Mandatory=$true)]
[System.Data.SQLClient.SQLConnection]
$Connection,
[parameter(position = 1, Mandatory=$true)]
[int]
$EventID,
[parameter(position = 2, Mandatory=$true)]
[string]
$IPAddress,
[parameter(position = 3, Mandatory=$true)]
[AllowEmptyString()]
[string]
$UserID,
[parameter(position = 4, Mandatory=$true)]
[AllowEmptyString()]
[string]
$Message
)
$Command = [System.Data.SqlClient.SqlCommand]::new('dbo.LogFailedLogin', $Connection)
$Command.CommandType = [System.Data.CommandType]::StoredProcedure
try
{
$null = $Command.Parameters.AddWithValue('@EventID', $EventID)
$null = $Command.Parameters.AddWithValue('@IPAddress', $IPAddress)
$null = $Command.Parameters.AddWithValue('@UserID', $UserID)
$null = $Command.Parameters.AddWithValue('@Message', $Message)
$Reader = $Command.ExecuteReader([System.Data.CommandBehavior]::SingleRow)
$FirewallRule = ''
try
{
if($Reader.Read())
{
#SP will return a result if a firewall rule needs to be created.
$FirewallGroup = $Reader.GetString(0)
$FirewallRule = $Reader.GetString(1)
$null = Add-BlockRule $IPAddress $FirewallRule $FirewallGroup
}
}
finally
{
$Reader.Dispose()
}
return $FirewallRule
}
finally
{
$Command.Dispose()
}
}
<#
Updates a blocked client after a firewall rule is created
#>
function Update-BlockedClient
{
[cmdletbinding()]
Param
(
[parameter(position = 0, Mandatory=$true)]
[System.Data.SQLClient.SQLConnection]
$Connection,
[parameter(position = 1, Mandatory=$true)]
[string]
$IPAddress,
[parameter(position = 2, Mandatory=$true)]
[string]
$FirewallRule
)
$Command = [System.Data.SqlClient.SqlCommand]::new('UpdateBlockedClient', $Connection)
$Command.CommandType = [System.Data.CommandType]::StoredProcedure
try
{
[void]$Command.Parameters.AddWithValue('@IPAddress', $IPAddress)
[void]$Command.Parameters.AddWithValue('@FirewallRule', $FirewallRule)
[void]$Command.ExecuteNonQuery()
}
finally
{
$Command.Dispose()
}
}
<#
Gets the server subnet for automatic whitelisting. Used by the installer.
#>
function Get-LANSubnet
{
$nic_config = gwmi -computer . -class "win32_networkadapterconfiguration" | Where-Object {$_.defaultIPGateway -ne $null}
$IPAddress = $nic_config.ipaddress
$SubnetMask = 0
switch ($nic_config.ipsubnet)
{
255.255.255.255 {$SubnetMask = 32}
255.255.255.254 {$SubnetMask = 31}
255.255.255.252 {$SubnetMask = 30}
255.255.255.248 {$SubnetMask = 29}
255.255.255.240 {$SubnetMask = 28}
255.255.255.224 {$SubnetMask = 27}
255.255.255.192 {$SubnetMask = 26}
255.255.255.128 {$SubnetMask = 25}
255.255.255.0 {$SubnetMask = 24}
255.255.254.0 {$SubnetMask = 23}
255.255.252.0 {$SubnetMask = 22}
255.255.248.0 {$SubnetMask = 21}
255.255.240.0 {$SubnetMask = 20}
255.255.224.0 {$SubnetMask = 19}
255.255.192.0 {$SubnetMask = 18}
255.255.128.0 {$SubnetMask = 17}
255.255.0.0 {$SubnetMask = 16}
255.254.0.0 {$SubnetMask = 15}
255.252.0.0 {$SubnetMask = 14}
255.248.0.0 {$SubnetMask = 13}
255.240.0.0 {$SubnetMask = 12}
255.224.0.0 {$SubnetMask = 11}
255.192.0.0 {$SubnetMask = 10}
255.128.0.0 {$SubnetMask = 9}
255.0.0.0 {$SubnetMask = 8}
254.0.0.0 {$SubnetMask = 7}
252.0.0.0 {$SubnetMask = 6}
248.0.0.0 {$SubnetMask = 5}
240.0.0.0 {$SubnetMask = 4}
224.0.0.0 {$SubnetMask = 3}
192.0.0.0 {$SubnetMask = 2}
}
$IPAddress
$SubnetMask
}
<#Task Scheduler functions#>
<#
Called by scheduled task to clear clients flagged for unblocking
or counter reset.
#>
function Clear-BlockedClients
{
$ConnectionString = Get-DBConnectionString
$Connection = [System.Data.SqlClient.SqlConnection]::new($ConnectionString)
$Command = [System.Data.SqlClient.SqlCommand]::new('dbo.ResetClients', $Connection)
$Command.CommandType = [System.Data.CommandType]::StoredProcedure
try
{
$Connection.Open()
# ResetClients deletes records in ClientStatus that need to be unblocked
# or counters reset. Returns a result set of firewall rules to delete.
$Reader = $Command.ExecuteReader([System.Data.CommandBehavior]::SingleResult)
try
{
while($Reader.Read())
{
$FirewallRule = $Reader.GetString(0)
Delete-BlockRule $FirewallRule 'SQL Server Login Monitor'
}
}
finally
{
$Reader.Dispose()
}
}
finally
{
$Command.Dispose()
$Connection.Dispose()
}
}
<#
Called by event-triggered task for login failures (event IDs 18456, 17828, 17832 and 17836)
#>
function On-FailedLogin
{
[cmdletbinding()]
Param
(
[parameter(position = 0, Mandatory=$true)]
[int]
$EventID,
[parameter(position = 1, Mandatory=$true)]
[string]
$EventData
)
$EventDataArray = Extract-EventData $EventID $EventData
$UserID = $EventDataArray[0]
$Message = $EventDataArray[1]
$IPAddress = $EventDataArray[2]
if($IPAddress -eq '')
{
return;
}
$ConnectionString = Get-DBConnectionString
$Connection = [System.Data.SQLClient.SQLConnection]::new($ConnectionString)
try
{
$Connection.Open()
$FirewallRule = Log-FailedLogin $Connection $EventID $IPAddress $UserID $Message
if($FirewallRule -ne '')
{
#Firewall rule was created so the record is updated in ClientStatus
Update-BlockedClient $Connection $IPAddress $FirewallRule
}
Log-GeoIP $Connection $IPAddress
}
finally
{
$Connection.Dispose()
}
}