1 files changed, 116 insertions, 0 deletions
diff --git a/cryptech_console b/cryptech_console
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+++ b/cryptech_console
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+#!/usr/bin/env python
+#
+# Copyright (c) 2017, NORDUnet A/S All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+# - Redistributions of source code must retain the above copyright notice,
+#   this list of conditions and the following disclaimer.
+#
+# - Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+#
+# - Neither the name of the NORDUnet nor the names of its contributors may
+#   be used to endorse or promote products derived from this software
+#   without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""
+Console client shim to work with Cryptech Python multiplexer.
+"""
+
+import os
+import sys
+import socket
+import atexit
+import termios
+import argparse
+
+import tornado.iostream
+import tornado.ioloop
+import tornado.gen
+
+class FemtoTerm(object):
+
+    def __init__(self, s):
+        self.termios_setup()
+        self.stdin_stream  = tornado.iostream.PipeIOStream(sys.stdin.fileno())
+        self.stdout_stream = tornado.iostream.PipeIOStream(sys.stdout.fileno())
+        self.socket_stream = tornado.iostream.IOStream(s)
+        self.closed = False
+
+    def close(self):
+        self.termios_teardown()
+        self.stdin_stream.close()
+        self.stdout_stream.close()
+        self.socket_stream.close()
+        self.closed = True
+
+    @tornado.gen.coroutine
+    def run(self):
+        yield [self.stdout_loop(), self.stdin_loop()]
+
+    def termios_setup(self):
+        self.fd = sys.stdin.fileno()
+        self.old_tcattr = termios.tcgetattr(self.fd)
+        self.new_tcattr = termios.tcgetattr(self.fd)
+        atexit.register(self.termios_teardown)
+        self.new_tcattr[3] &= ~(termios.ICANON | termios.ECHO) #  | termios.ISIG
+        self.new_tcattr[6][termios.VMIN] = 1
+        self.new_tcattr[6][termios.VTIME] = 0
+        termios.tcsetattr(self.fd, termios.TCSANOW, self.new_tcattr)
+
+    def termios_teardown(self):
+        if self.fd is not None:
+            termios.tcsetattr(self.fd, termios.TCSAFLUSH, self.old_tcattr)
+            self.fd = None
+
+    @tornado.gen.coroutine
+    def copy_loop(self, stream1, stream2, text1, text2, buffer_size = 1024):
+        try:
+            while not self.closed:
+                buffer = yield stream1.read_bytes(buffer_size, partial = True)
+                yield stream2.write(buffer.replace(text1, text2))
+        except tornado.iostream.StreamClosedError:
+            self.close()
+
+    def stdin_loop(self):
+        return self.copy_loop(self.stdin_stream, self.socket_stream, "\n", "\r")
+
+    def stdout_loop(self):
+        return self.copy_loop(self.socket_stream, self.stdout_stream, "\r\n", "\n")
+
+def main():
+    parser = argparse.ArgumentParser(formatter_class = argparse.ArgumentDefaultsHelpFormatter)
+    parser.add_argument("cty_socket",
+                        nargs = "?",
+                        help = "CTY PF_UNIX socket name",
+                        default = os.getenv("CRYPTECH_CTY_CLIENT_SOCKET_NAME",
+                                            "/tmp/.cryptech_muxd.cty"))
+    args = parser.parse_args()
+
+    s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    try:
+        s.connect(args.cty_socket)
+    except socket.error:
+        sys.exit("Couldn't connect to socket {}".format(args.cty_socket))
+    tornado.ioloop.IOLoop.current().run_sync(FemtoTerm(s).run)
+
+if __name__ == "__main__":
+    try:
+        main()
+    except KeyboardInterrupt:
+        pass