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#!/usr/bin/env python 

from mod_python import apache
from mod_python import util
import httplib2
import hashlib
from base64 import b64encode, b64decode
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from Crypto.Cipher import Blowfish
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from Crypto.Cipher import AES
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from Crypto import Random
from struct import pack
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import urllib
from string import replace
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from binascii import hexlify, unhexlify

from interop import decrypt
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def write_var (req, var, filename):
    log_path=req.document_root() + '/assertions/' + filename
    logfile=open(log_path, 'w')
    logfile.write(var)
    logfile.close
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def handler(req):
    assertionLocation = str(req.subprocess_env['Shib-Assertion-01'])
    h1 = httplib2.HTTPSConnectionWithTimeout('saml-delegation.data.kit.edu')

    # get the path portion of the assertion link
    (i, assertionPath) = assertionLocation.split('https://saml-delegation.data.kit.edu')

    # get the assertion
    h1.request('GET', assertionPath)
    response = h1.getresponse()
    assertion = response.read()

    # remove newlines
    assertion = assertion.replace("\n", "")

    # find out at which url we were called
    (none, none, location) = req.uri.split('/')

    # sso
    if location == 'sso.py':
        req.content_type = 'text/html'
        req.write('''<!DOCTYPE html>
            <html>
            <head>
            <meta http-equiv="refresh" content="1
                  URL=https://saml-delegation.data.kit.edu/sd/ecp.py">
                  <!--   URI:     %s -->
            </head>
            <body>
            <br/>
            Save your assertion as "/tmp/samlup_uXXXX.tmp" where you replace
                  "XXXX" with your user id.<br>
            </body>
            </html>'''% req.uri)
        return apache.OK
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    ############################
     # js: sso via javascript #
    ############################
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    if location == 'js.py':
        req.content_type = 'text/html'
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        req.write('''<!DOCTYPE html> <meta charset="ASCII" />
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            <html>
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<!-- TODO(daniel): host locally; jquery v1 for included IE support.. --!>
<script src="js/crypto-js/aes.js"></script>
<script src="js/jquery-1.11.1.min.js"></script>
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                  <p> Obtaining temporary password url </p>
                  <table border="1">
                  <tr> <th>  Action                      </th><th> Status </th></tr>
                  <tr> <td>  Get assertion:              </td><td id="stat_get">  Wait </td> </tr>
                  <tr> <td>  Encrypting assertion:       </td><td id="stat_enc">  Wait </td> </tr>
                  <tr> <td>  Upload encrypted assertion  </td><td id="stat_post"> Wait </td> </tr>
                  </table>

                  <br/><p> You can now use this URL as a temporary password:<br/>
                  <b id="url"> Wait </b></p>
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<script src="js-new.js"></script>
                <head> </head>
                <body> </body>
            </html> ''')
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        return apache.OK

    # ecp
    if location == 'ecp.py':
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        # octet stream will force saving to disk, while
        # text will allow to open with a text editor
        #req.content_type='application/octet-stream'\
        req.content_type='application/text'\
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                '\nContent-Disposition: attachment; filename=samlup_uXXXX.tmp'
        req.write(assertion)
        return apache.OK
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    ########
    # test #
    ########
    if location in ( 'test_transport.py') :
        buf = req.read()
        write_var (req, buf, 'buf')
        req.write('Transport test done')
        return apache.OK

    if location in ( 'test_assertion.py') :
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        req.content_type = 'text/plain'
        form = util.FieldStorage(req)
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        b64_encrypted_assertion = form.get("encrypted_assertion", "Error: No assertion field sent").replace(' ', '+')
        write_var (req, b64_encrypted_assertion, "b64_encrypted_assertion")
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        return apache.OK
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    ############
    #  upload  #
    ############
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    if location in ( 'upload.py', 'jsupload.py'):
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        req.content_type = 'text/plain'
        # we expect the data via post in encrypted assertion.
        # we will return the url of where to collect the assertion
        # request.
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        if req.method != 'POST':
            req.write("Error, i was expecting a post request")
            return apache.OK
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        form = util.FieldStorage(req)
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        client = form.get ("client", "oops").replace(' ', '+')
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        if not form.has_key("encrypted_assertion"):
            req.write ("Error: did not obtain the encrypted_assertion")
            return apache.OK
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        b64 = form.get("encrypted_assertion", "Error: no assertion present").replace(' ', '+')
        write_var (req, b64, 'b64')
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        client_version = form.get ("client_verions", "oops").replace(' ', '+')
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        # decode assertion
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        if client == 'perl':
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            encrypted_assertion = b64decode(b64)
        elif client == 'javascript':
            encrypted_assertion = unhexlify(b64)
        else:
            req.write ('client not supported')
            return apache.OK
        write_var (req, encrypted_assertion, 'encrypted_assertion')
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        # create hash
        assertion_hash = str(hashlib.md5(encrypted_assertion).hexdigest())
        assertion_url ='https://' + req.hostname + '/assertions/' + assertion_hash
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        # return the url as key=value FIXME
        req.write("url=%s" % assertion_url)
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        #req.write("%s" % assertion_url)
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        #########
        # debug #
        #########
        # decrypt assertion in case password is provided
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        if form.has_key("key"):
            enc_key = form.get("key", "")
            client = form.get("client","")
            if client == "perl":
                key = b64decode(enc_key)
            if  client == "javascript":
                iv  = unhexlify(form.get("iv",""))
                key = unhexlify(enc_key)
                enc_ass = encrypted_assertion
                encrypted_assertion = iv + enc_ass

            write_var(req,enc_key, "key")
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            write_var(req, encrypted_assertion, 'encrypted_assertion')
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            # some logging
            log_path=req.document_root() + '/assertions/' + 'log'
            logfile=open(log_path, 'w')
            logfile.write("keylen:    %d\n" % len(key))
            logfile.write("cipherlen: %d\n" % len(encrypted_assertion))
            #logfile.write("iv:        %d\n" % len(iv))
            logfile.close
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            plaintext = decrypt(key, encrypted_assertion)
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            write_var(req, plaintext, 'plaintext')
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        return apache.OK

    req.content_type = 'text/plain'
    req.write("Error: Your request was not understood")
    return apache.OK
    #return apache.HTTP_BAD_REQUEST
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# Some leftovers:

#bs = Blowfish.block_size
#iv = '12333123'
#cipher = Blowfish.new(key, Blowfish.MODE_ECB, iv)
#cipher = new Crypt::CBC (symmetric_key, 'Twofish');
#my plaintext = cipher->decrypt(encrypted_assertion);
#print ("\n".plaintext."\n");

##plaintext = b'docendo discimus '
##plen = bs - divmod(len(plaintext),bs)[1]
##padding = [plen]*plen
##padding = pack('b'*plen, *padding)

Imprint