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Mini Shell
Mini Shell
=begin
= $RCSfile$ -- SSL/TLS enhancement for Net::Telnet.
= Info
'OpenSSL for Ruby 2' project
Copyright (C) 2001 GOTOU YUUZOU <gotoyuzo@notwork.org>
All rights reserved.
= Licence
This program is licenced under the same licence as Ruby.
(See the file 'LICENCE'.)
= Version
$Id: telnets.rb 13657 2007-10-08 11:16:54Z gotoyuzo $
2001/11/06: Contiributed to Ruby/OpenSSL project.
== class Net::Telnet
This class will initiate SSL/TLS session automaticaly if the server
sent OPT_STARTTLS. Some options are added for SSL/TLS.
host = Net::Telnet::new({
"Host" => "localhost",
"Port" => "telnets",
## follows are new options.
'CertFile' => "user.crt",
'KeyFile' => "user.key",
'CAFile' => "/some/where/certs/casert.pem",
'CAPath' => "/some/where/caserts",
'VerifyMode' => SSL::VERIFY_PEER,
'VerifyCallback' => verify_proc
})
Or, the new options ('Cert', 'Key' and 'CACert') are available from
Michal Rokos's OpenSSL module.
cert_data = File.open("user.crt"){|io| io.read }
pkey_data = File.open("user.key"){|io| io.read }
cacert_data = File.open("your_ca.pem"){|io| io.read }
host = Net::Telnet::new({
"Host" => "localhost",
"Port" => "telnets",
'Cert' => OpenSSL::X509::Certificate.new(cert_data)
'Key' => OpenSSL::PKey::RSA.new(pkey_data)
'CACert' => OpenSSL::X509::Certificate.new(cacert_data)
'CAFile' => "/some/where/certs/casert.pem",
'CAPath' => "/some/where/caserts",
'VerifyMode' => SSL::VERIFY_PEER,
'VerifyCallback' => verify_proc
})
This class is expected to be a superset of usual Net::Telnet.
=end
require "net/telnet"
require "openssl"
module Net
class Telnet
attr_reader :ssl
OPT_STARTTLS = 46.chr # "\056" # "\x2e" # Start TLS
TLS_FOLLOWS = 1.chr # "\001" # "\x01" # FOLLOWS (for STARTTLS)
alias preprocess_orig preprocess
def ssl?; @ssl; end
def preprocess(string)
# combine CR+NULL into CR
string = string.gsub(/#{CR}#{NULL}/no, CR) if @options["Telnetmode"]
# combine EOL into "\n"
string = string.gsub(/#{EOL}/no, "\n") unless @options["Binmode"]
string.gsub(/#{IAC}(
[#{IAC}#{AO}#{AYT}#{DM}#{IP}#{NOP}]|
[#{DO}#{DONT}#{WILL}#{WONT}][#{OPT_BINARY}-#{OPT_EXOPL}]|
#{SB}[#{OPT_BINARY}-#{OPT_EXOPL}]
(#{IAC}#{IAC}|[^#{IAC}])+#{IAC}#{SE}
)/xno) do
if IAC == $1 # handle escaped IAC characters
IAC
elsif AYT == $1 # respond to "IAC AYT" (are you there)
self.write("nobody here but us pigeons" + EOL)
''
elsif DO[0] == $1[0] # respond to "IAC DO x"
if OPT_BINARY[0] == $1[1]
@telnet_option["BINARY"] = true
self.write(IAC + WILL + OPT_BINARY)
elsif OPT_STARTTLS[0] == $1[1]
self.write(IAC + WILL + OPT_STARTTLS)
self.write(IAC + SB + OPT_STARTTLS + TLS_FOLLOWS + IAC + SE)
else
self.write(IAC + WONT + $1[1..1])
end
''
elsif DONT[0] == $1[0] # respond to "IAC DON'T x" with "IAC WON'T x"
self.write(IAC + WONT + $1[1..1])
''
elsif WILL[0] == $1[0] # respond to "IAC WILL x"
if OPT_BINARY[0] == $1[1]
self.write(IAC + DO + OPT_BINARY)
elsif OPT_ECHO[0] == $1[1]
self.write(IAC + DO + OPT_ECHO)
elsif OPT_SGA[0] == $1[1]
@telnet_option["SGA"] = true
self.write(IAC + DO + OPT_SGA)
else
self.write(IAC + DONT + $1[1..1])
end
''
elsif WONT[0] == $1[0] # respond to "IAC WON'T x"
if OPT_ECHO[0] == $1[1]
self.write(IAC + DONT + OPT_ECHO)
elsif OPT_SGA[0] == $1[1]
@telnet_option["SGA"] = false
self.write(IAC + DONT + OPT_SGA)
else
self.write(IAC + DONT + $1[1..1])
end
''
elsif SB[0] == $1[0] # respond to "IAC SB xxx IAC SE"
if OPT_STARTTLS[0] == $1[1] && TLS_FOLLOWS[0] == $2[0]
@sock = OpenSSL::SSL::SSLSocket.new(@sock)
@sock.cert = @options['Cert'] unless @sock.cert
@sock.key = @options['Key'] unless @sock.key
@sock.ca_cert = @options['CACert']
@sock.ca_file = @options['CAFile']
@sock.ca_path = @options['CAPath']
@sock.timeout = @options['Timeout']
@sock.verify_mode = @options['VerifyMode']
@sock.verify_callback = @options['VerifyCallback']
@sock.verify_depth = @options['VerifyDepth']
@sock.connect
if @options['VerifyMode'] != OpenSSL::SSL::VERIFY_NONE
@sock.post_connection_check(@options['Host'])
end
@ssl = true
end
''
else
''
end
end
end # preprocess
alias waitfor_org waitfor
def waitfor(options)
time_out = @options["Timeout"]
waittime = @options["Waittime"]
if options.kind_of?(Hash)
prompt = if options.has_key?("Match")
options["Match"]
elsif options.has_key?("Prompt")
options["Prompt"]
elsif options.has_key?("String")
Regexp.new( Regexp.quote(options["String"]) )
end
time_out = options["Timeout"] if options.has_key?("Timeout")
waittime = options["Waittime"] if options.has_key?("Waittime")
else
prompt = options
end
if time_out == false
time_out = nil
end
line = ''
buf = ''
@rest = '' unless @rest
until(prompt === line and not IO::select([@sock], nil, nil, waittime))
unless IO::select([@sock], nil, nil, time_out)
raise TimeoutError, "timed-out; wait for the next data"
end
begin
c = @rest + @sock.sysread(1024 * 1024)
@dumplog.log_dump('<', c) if @options.has_key?("Dump_log")
if @options["Telnetmode"]
pos = 0
catch(:next){
while true
case c[pos]
when IAC[0]
case c[pos+1]
when DO[0], DONT[0], WILL[0], WONT[0]
throw :next unless c[pos+2]
pos += 3
when SB[0]
ret = detect_sub_negotiation(c, pos)
throw :next unless ret
pos = ret
when nil
throw :next
else
pos += 2
end
when nil
throw :next
else
pos += 1
end
end
}
buf = preprocess(c[0...pos])
@rest = c[pos..-1]
end
@log.print(buf) if @options.has_key?("Output_log")
line.concat(buf)
yield buf if block_given?
rescue EOFError # End of file reached
if line == ''
line = nil
yield nil if block_given?
end
break
end
end
line
end
private
def detect_sub_negotiation(data, pos)
return nil if data.length < pos+6 # IAC SB x param IAC SE
pos += 3
while true
case data[pos]
when IAC[0]
if data[pos+1] == SE[0]
pos += 2
return pos
else
pos += 2
end
when nil
return nil
else
pos += 1
end
end
end
end
end
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