135 lines
4.1 KiB
Ruby
135 lines
4.1 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Auxiliary
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include Msf::Exploit::Remote::Tcp
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include Msf::Auxiliary::WmapScanSSL
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include Msf::Auxiliary::Scanner
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include Msf::Auxiliary::Report
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include Rex::Socket::Comm
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def initialize
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super(
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'Name' => 'HTTP SSL Certificate Information',
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'Description' => 'Parse the server SSL certificate to obtain the common name and signature algorithm',
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'Author' =>
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[
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'et', #original module
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'Chris John Riley', #additions
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'Veit Hailperin <hailperv[at]gmail.com>', # checks for public key size, valid time
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],
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'License' => MSF_LICENSE
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)
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register_options([
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Opt::RPORT(443)
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], self.class)
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end
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# Fingerprint a single host
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def run_host(ip)
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begin
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connect(true, {"SSL" => true}) #Force SSL
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cert = OpenSSL::X509::Certificate.new(sock.peer_cert)
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disconnect
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if cert
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print_status("#{ip}:#{rport} Subject: #{cert.subject}")
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print_status("#{ip}:#{rport} Issuer: #{cert.issuer}")
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print_status("#{ip}:#{rport} Signature Alg: #{cert.signature_algorithm}")
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public_key_size = cert.public_key.n.num_bytes * 8
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print_status("#{ip}:#{rport} Public Key Size: #{public_key_size} bits")
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print_status("#{ip}:#{rport} Not Valid Before: #{cert.not_before}")
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print_status("#{ip}:#{rport} Not Valid After: #{cert.not_after}")
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# Checks for common properties of self signed certificates
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caissuer = (/CA Issuers - URI:(.*?),/i).match(cert.extensions.to_s)
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if caissuer.to_s.empty?
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print_good("#{ip}:#{rport} Certificate contains no CA Issuers extension... possible self signed certificate")
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else
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print_status("#{ip}:#{rport} " +caissuer.to_s[0..-2])
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end
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if cert.issuer.to_s == cert.subject.to_s
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print_good("#{ip}:#{rport} Certificate Subject and Issuer match... possible self signed certificate")
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end
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alg = cert.signature_algorithm
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if alg.downcase.include? "md5"
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print_status("#{ip}:#{rport} WARNING: Signature algorithm using MD5 (#{alg})")
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end
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vhostn = nil
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cert.subject.to_a.each do |n|
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vhostn = n[1] if n[0] == 'CN'
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end
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if public_key_size == 1024
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print_status("#{ip}:#{rport} WARNING: Public Key only 1024 bits")
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elsif public_key_size < 1024
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print_status("#{ip}:#{rport} WARNING: Weak Public Key: #{public_key_size} bits")
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end
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if cert.not_after < Time.now
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print_status("#{ip}:#{rport} WARNING: Certificate not valid anymore")
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end
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if cert.not_before > Time.now
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print_status("#{ip}:#{rport} WARNING: Certificate not valid yet")
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end
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if vhostn
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print_status("#{ip}:#{rport} has common name #{vhostn}")
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# Store the virtual hostname for HTTP
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report_note(
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:host => ip,
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:port => rport,
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:proto => 'tcp',
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:type => 'http.vhost',
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:data => {:name => vhostn}
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)
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# Store the SSL certificate itself
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report_note(
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:host => ip,
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:proto => 'tcp',
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:port => rport,
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:type => 'ssl.certificate',
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:data => {
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:cn => vhostn,
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:subject => cert.subject.to_a,
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:algorithm => alg,
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:valid_from => cert.not_before,
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:valid_after => cert.not_after,
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:key_size => public_key_size
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}
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)
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# Update the server hostname if necessary
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if vhostn !~ /localhost|snakeoil/i
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report_host(
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:host => ip,
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:name => vhostn
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)
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end
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end
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else
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print_status("#{ip}:#{rport}] No certificate subject or common name found")
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end
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rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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rescue ::Timeout::Error, ::Errno::EPIPE
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end
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end
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end
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