PowerShell PoC to grab the 'CN' common name of the SSL/TLS cert of an IP - leveraging NMAP SSL-cert script

SSL_TLS_cert_CN_pull_via_NMAP.ps1

<#
Nicholas Leader
9.3.2019

PowerShell PoC to grab the 'CN' common name of the SSL/TLS cert of an IP
Script takes an array of IPs as input in the script, but could be modified to pull from a CSV, etc
Script is leveraging 'Invoke-Command' to run an NMAP script
Using 'Select-string' to pull the relevent line of the NMAP script output

Requires:
    PowerShell
    NMAP (need to be callable via PATH environmental variable)    

#>

## these example IPs are Twitter IPs
$ips = @("199.59.148.10","199.59.148.11")

$ips |
 ForEach-Object {Invoke-Command {nmap --script ssl-cert $_} | 
 select-string "ssl-cert: Subject: commonName="