370 lines
8.5 KiB
Ruby
370 lines
8.5 KiB
Ruby
# -*- coding: binary -*-
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require 'rex/socket'
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###
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#
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# This class provides methods for interacting with an SSL TCP client
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# connection.
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#
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###
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module Rex::Socket::SslTcp
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begin
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@@loaded_openssl = false
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begin
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require 'openssl'
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@@loaded_openssl = true
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require 'openssl/nonblock'
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rescue ::Exception
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end
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include Rex::Socket::Tcp
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##
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#
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# Factory
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#
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##
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#
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# Creates an SSL TCP instance.
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#
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def self.create(hash = {})
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raise RuntimeError, "No OpenSSL support" if not @@loaded_openssl
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hash['SSL'] = true
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self.create_param(Rex::Socket::Parameters.from_hash(hash))
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end
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#
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# Set the SSL flag to true and call the base class's create_param routine.
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#
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def self.create_param(param)
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param.ssl = true
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Rex::Socket::Tcp.create_param(param)
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end
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##
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#
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# Class initialization
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#
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##
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#
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# Initializes the SSL socket.
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#
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def initsock(params = nil)
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super
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# Default to SSLv23 (automatically negotiate)
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version = :SSLv23
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# Let the caller specify a particular SSL/TLS version
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if params
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case params.ssl_version
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when 'SSL2', :SSLv2
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version = :SSLv2
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# 'TLS' will be the new name for autonegotation with newer versions of OpenSSL
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when 'SSL23', :SSLv23, 'TLS'
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version = :SSLv23
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when 'SSL3', :SSLv3
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version = :SSLv3
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when 'TLS1','TLS1.0', :TLSv1
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version = :TLSv1
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when 'TLS1.1', :TLSv1_1
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version = :TLSv1_1
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when 'TLS1.2', :TLSv1_2
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version = :TLSv1_2
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end
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end
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# Raise an error if no selected versions are supported
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if ! OpenSSL::SSL::SSLContext::METHODS.include? version
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raise ArgumentError, 'The system OpenSSL does not support the requested SSL/TLS version'
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end
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# Try intializing the socket with this SSL/TLS version
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# This will throw an exception if it fails
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initsock_with_ssl_version(params, version)
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# Track the SSL version
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self.ssl_negotiated_version = version
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end
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def initsock_with_ssl_version(params, version)
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# Build the SSL connection
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self.sslctx = OpenSSL::SSL::SSLContext.new(version)
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# Configure the SSL context
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# TODO: Allow the user to specify the verify mode callback
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# Valid modes:
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# VERIFY_CLIENT_ONCE
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# VERIFY_FAIL_IF_NO_PEER_CERT
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# VERIFY_NONE
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# VERIFY_PEER
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if params.ssl_verify_mode
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self.sslctx.verify_mode = OpenSSL::SSL.const_get("VERIFY_#{params.ssl_verify_mode}".intern)
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else
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# Could also do this as graceful faildown in case a passed verify_mode is not supported
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self.sslctx.verify_mode = OpenSSL::SSL::VERIFY_PEER
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end
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self.sslctx.options = OpenSSL::SSL::OP_ALL
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if params.ssl_cipher
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self.sslctx.ciphers = params.ssl_cipher
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end
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# Set the verification callback
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self.sslctx.verify_callback = Proc.new do |valid, store|
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self.peer_verified = valid
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true
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end
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# Tie the context to a socket
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self.sslsock = OpenSSL::SSL::SSLSocket.new(self, self.sslctx)
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# Force a negotiation timeout
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begin
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Timeout.timeout(params.timeout) do
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if not allow_nonblock?
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self.sslsock.connect
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else
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begin
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self.sslsock.connect_nonblock
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# Ruby 1.8.7 and 1.9.0/1.9.1 uses a standard Errno
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rescue ::Errno::EAGAIN, ::Errno::EWOULDBLOCK
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IO::select(nil, nil, nil, 0.10)
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retry
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# Ruby 1.9.2+ uses IO::WaitReadable/IO::WaitWritable
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rescue ::Exception => e
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if ::IO.const_defined?('WaitReadable') and e.kind_of?(::IO::WaitReadable)
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IO::select( [ self.sslsock ], nil, nil, 0.10 )
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retry
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end
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if ::IO.const_defined?('WaitWritable') and e.kind_of?(::IO::WaitWritable)
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IO::select( nil, [ self.sslsock ], nil, 0.10 )
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retry
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end
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raise e
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end
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end
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end
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rescue ::Timeout::Error
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raise Rex::ConnectionTimeout.new(params.peerhost, params.peerport)
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end
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end
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##
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#
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# Stream mixin implementations
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#
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##
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#
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# Writes data over the SSL socket.
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#
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def write(buf, opts = {})
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return sslsock.write(buf) if not allow_nonblock?
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total_sent = 0
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total_length = buf.length
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block_size = 16384
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retry_time = 0.5
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begin
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while( total_sent < total_length )
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s = Rex::ThreadSafe.select( nil, [ self.sslsock ], nil, 0.25 )
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if( s == nil || s[0] == nil )
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next
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end
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data = buf[total_sent, block_size]
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sent = sslsock.write_nonblock( data )
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if sent > 0
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total_sent += sent
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end
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end
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rescue ::IOError, ::Errno::EPIPE
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return nil
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# Ruby 1.8.7 and 1.9.0/1.9.1 uses a standard Errno
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rescue ::Errno::EAGAIN, ::Errno::EWOULDBLOCK
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# Sleep for a half a second, or until we can write again
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Rex::ThreadSafe.select( nil, [ self.sslsock ], nil, retry_time )
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# Decrement the block size to handle full sendQs better
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block_size = 1024
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# Try to write the data again
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retry
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# Ruby 1.9.2+ uses IO::WaitReadable/IO::WaitWritable
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rescue ::Exception => e
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if ::IO.const_defined?('WaitReadable') and e.kind_of?(::IO::WaitReadable)
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IO::select( [ self.sslsock ], nil, nil, retry_time )
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retry
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end
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if ::IO.const_defined?('WaitWritable') and e.kind_of?(::IO::WaitWritable)
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IO::select( nil, [ self.sslsock ], nil, retry_time )
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retry
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end
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# Another form of SSL error, this is always fatal
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if e.kind_of?(::OpenSSL::SSL::SSLError)
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return nil
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end
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# Bubble the event up to the caller otherwise
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raise e
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end
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total_sent
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end
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#
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# Reads data from the SSL socket.
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#
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def read(length = nil, opts = {})
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if not allow_nonblock?
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length = 16384 unless length
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begin
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return sslsock.sysread(length)
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rescue ::IOError, ::Errno::EPIPE, ::OpenSSL::SSL::SSLError
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return nil
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end
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return
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end
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begin
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while true
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s = Rex::ThreadSafe.select( [ self.sslsock ], nil, nil, 0.10 )
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if( s == nil || s[0] == nil )
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next
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end
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return sslsock.read_nonblock( length )
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end
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rescue ::IOError, ::Errno::EPIPE
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return nil
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# Ruby 1.8.7 and 1.9.0/1.9.1 uses a standard Errno
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rescue ::Errno::EAGAIN, ::Errno::EWOULDBLOCK
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# Sleep for a tenth a second, or until we can read again
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Rex::ThreadSafe.select( [ self.sslsock ], nil, nil, 0.10 )
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# Decrement the block size to handle full sendQs better
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block_size = 1024
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# Try to write the data again
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retry
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# Ruby 1.9.2+ uses IO::WaitReadable/IO::WaitWritable
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rescue ::Exception => e
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if ::IO.const_defined?('WaitReadable') and e.kind_of?(::IO::WaitReadable)
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IO::select( [ self.sslsock ], nil, nil, 0.5 )
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retry
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end
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if ::IO.const_defined?('WaitWritable') and e.kind_of?(::IO::WaitWritable)
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IO::select( nil, [ self.sslsock ], nil, 0.5 )
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retry
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end
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# Another form of SSL error, this is always fatal
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if e.kind_of?(::OpenSSL::SSL::SSLError)
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return nil
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end
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raise e
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end
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end
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#
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# Closes the SSL socket.
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#
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def close
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sslsock.close rescue nil
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super
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end
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#
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# Ignore shutdown requests
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#
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def shutdown(how=0)
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# Calling shutdown() on an SSL socket can lead to bad things
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# Cause of http://metasploit.com/dev/trac/ticket/102
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end
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#
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# Access to peer cert
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#
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def peer_cert
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sslsock.peer_cert if sslsock
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end
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#
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# Access to peer cert chain
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#
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def peer_cert_chain
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sslsock.peer_cert_chain if sslsock
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end
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#
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# Access to the current cipher
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#
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def cipher
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sslsock.cipher if sslsock
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end
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#
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# Prevent a sysread from the bare socket
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#
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def sysread(*args)
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raise RuntimeError, "Invalid sysread() call on SSL socket"
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end
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#
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# Prevent a sysread from the bare socket
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#
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def syswrite(*args)
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raise RuntimeError, "Invalid syswrite() call on SSL socket"
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end
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#
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# This flag determines whether to use the non-blocking openssl
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# API calls when they are available. This is still buggy on
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# Linux/Mac OS X, but is required on Windows
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#
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def allow_nonblock?
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avail = self.sslsock.respond_to?(:accept_nonblock)
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if avail and Rex::Compat.is_windows
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return true
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end
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false
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end
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attr_reader :peer_verified # :nodoc:
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attr_reader :ssl_negotiated_version # :nodoc:
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attr_accessor :sslsock, :sslctx, :sslhash # :nodoc:
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def type?
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return 'tcp-ssl'
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end
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protected
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attr_writer :peer_verified # :nodoc:
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attr_writer :ssl_negotiated_version # :nodoc:
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rescue LoadError
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end
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end
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