密码锁蜜罐FileSystemWatcher

Question

当涉及到脚本时，我是一个新手，所以请容忍我。我正在尝试创建一个脚本来监视添加到服务器上所有文件共享中的诱饵文件。当脚本看到文件被修改时，它将阻止对进行修改的用户的访问，并发送电子邮件。除了FileSystemWatcher之外，脚本似乎还能正常工作。它只会监控最后一股。我在这里看到了一个类似职位，但是我对答案感到困惑。有人能帮我为每个诱饵文件创建一个FileSystemWatcher吗？我还想要任何关于如何以其他方式改进脚本的意见。非常感谢你的帮助。

$to = "joe@blow.com"
$File = "test.txt" 
$FilePath = "C:\temp"
$md5 = new-object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider

## SEND MAIL FUNCTION
function sendMail($s, $to) {
    $smtpServer = "mail.nowhere.com"
    $smtpFrom = "alert@nowhere.com"
    $smtpTo = $to

    $messageSubject = $s[0]
    $message = New-Object System.Net.Mail.MailMessage $smtpfrom, $smtpto
    $message.Subject = $messageSubject
    $message.IsBodyHTML = $false
    $message.Body = $s[1]

    $smtp = New-Object Net.Mail.SmtpClient($smtpServer)
    $smtp.Send($message)
}

## Get a list of shares and Perform tasks on each location.
$cryptopaths = Get-WmiObject -Class win32_share -filter "Type=0 AND name like '%[^$]'" | ForEach ($_.Path) {
    $cryptopath = $_.Path

    ## Copy the bait file to the share location
    Copy $FilePath\$File $cryptopath\$File -Force

    ##Get files hash
    Try {
        $Origin = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes("$FilePath\$File")))
        $Copy = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes("$CryptoPath\$File")))

    }
     ##Error on reading hash
        Catch {
            echo "error reading $CryptoPath\$File" 
        }

    ## If files don't match, then Send messaged and quit
    if (Compare-Object $Origin $Copy){
        ## files don't match
        $subject = "Error logged on $CryptoPath\$File by $env:username on $env:computername"
        $body = "The original file does not match the witness file.  Aborting monitor script."
        $email =@($subject,$body)
        sendMail -s $email -to "ben22@nowhere.com"
        Exit
        }




    ## CREATE WATCHER ON DIRECTORY
    $watcher = New-Object System.IO.FileSystemWatcher
    $watcher.Path = $CryptoPath
    $watcher.Filter = $File
    $watcher.IncludeSubdirectories = $false
    $watcher.EnableRaisingEvents = $false
    $watcher.NotifyFilter = [System.IO.NotifyFilters]::LastWrite -bor [System.IO.NotifyFilters]::FileName
}


## Execute Watcher
while($TRUE){
    $result = $watcher.WaitForChanged([System.IO.WatcherChangeTypes]::Changed `
        -bor [System.IO.WatcherChangeTypes]::Renamed `
        -bor [System.IO.WatcherChangeTypes]::Deleted `
        -bor [System.IO.WatcherChangeTypes]::Created, 1000);
    if ($result.TimedOut){
        continue;
    }

    if ($result.Name -eq $File) {
        ### Make sure the files do not match
        try {
            $FileCheck = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes("$CryptoPath\$File")))
            if (Compare-Object $Origin $FileCheck){
                ## files don't match
                $body = "Witness file $FilePath\$File on $env:computername has been modified."
                }
        }
        catch {
            ## file deleted
            $body = "Witness file $FilePath\$File on $env:computername has been deleted"
            }
        finally {
            ## Deny owner of changed file access to shares and disconnect their open sessions. Send email alert
            Get-Acl "$CryptoPath\$File" | foreach ($_.Owner) {
            Get-SmbShare | Block-SmbShareAccess –AccountName $_.Owner
            Close-SmbSession –ClientUserName $_.Owner
            }
            $subject = "EMERGENCY ON FILE SERVER -- $FilePath\$File by $env:username on $env:computername"
            $email =@($subject,$body)
            sendMail -s $email -to "ben22@nowhere.com"
            sendMail -s $email -to "5555555555@txt.bell.ca"
            Exit

        }

    }

}

Answer 1

问题是在循环中创建FileSystemWatcher实例(ForEach ($_.Path) {})，但是将它们分配给相同的变量$watcher，每次都覆盖前面的引用。在循环之外，您将使用$watcher变量，该变量引用您创建的最后一个FileSystemWatcher实例，这就是为什么您只接收最后一个文件的通知。

要做到这一点，您应该使用允许存储多个引用的类型--也就是说，一个数组。示例：

$watchers = @();
...
$watcher = New-Object System.IO.FileSystemWatcher;
...
$watchers += $watcher;

此外，我建议使用基于事件处理程序/回调/委托的方法，而不是使用WaitForChanged()等待更改，因为等待多个文件系统观察者将要求并行化解决方案(理想情况下)。使用寄存器-ObjectEvent注册事件处理程序，并特别查看此示例：http://gallery.technet.microsoft.com/scriptcenter/Powershell-FileSystemWatche-dfd7084b。

PowerShellPack还有一个Start-FileSystemWatcher cmdlet，它很好地包装了这一切，但我不确定PowerShellPack的总体状态。不过，它应该是Windows 7/8资源工具包的一部分。