"""
Fetches a URL from a web-server supporting NTLM authentication
eg, IIS.

If no arguments are specified, a default of http://localhost/localstart.asp
is used.  This script does follow simple 302 redirections, so pointing at the
root of an IIS server is should work.
"""

import sys
import urllib
import httplib
import urlparse
from base64 import encodestring, decodestring

from sspi import ClientAuth

import optparse # sorry, this demo needs 2.3+

options = None # set to optparse options object

def open_url(host, url):
    h = httplib.HTTPConnection(host)
#    h.set_debuglevel(9)
    h.putrequest('GET', url)
    h.endheaders()
    resp = h.getresponse()
    print "Initial response is", resp.status, resp.reason
    body = resp.read()
    if resp.status == 302: # object moved
        url = "/" + resp.msg["location"]
        resp.close()
        h.putrequest('GET', url)
        h.endheaders()
        resp = h.getresponse()
        print "After redirect response is", resp.status, resp.reason
    if options.show_headers:
        print "Initial response headers:"
        for name, val in resp.msg.items():
            print " %s: %s" % (name, val)
    if options.show_body:
        print body
    if resp.status == 401:
        # 401: Unauthorized - here is where the real work starts
        auth_info = None
        if options.user or options.domain or options.password:
            auth_info = options.user, options.domain, options.password
        ca = ClientAuth("NTLM", auth_info=auth_info)
        auth_scheme = ca.pkg_info['Name']
        data = None
        while 1:
            err, out_buf = ca.authorize(data)
            data = out_buf[0].Buffer
            # Encode it as base64 as required by HTTP
            auth = encodestring(data).replace("\012", "")
            h.putrequest('GET', url)
            h.putheader('Authorization', auth_scheme + ' ' + auth)
            h.putheader('Content-Length', '0')
            h.endheaders()
            resp = h.getresponse()
            if options.show_headers:
                print "Token dance headers:"
                for name, val in resp.msg.items():
                    print " %s: %s" % (name, val)

            if err==0:
                break
            else:
                if resp.status != 401:
                    print "Eeek - got response", resp.status
                    cl = resp.msg.get("content-length")
                    if cl:
                        print repr(resp.read(int(cl)))
                    else:
                        print "no content!"

                assert resp.status == 401, resp.status

            assert not resp.will_close, "NTLM is per-connection - must not close"
            schemes = [s.strip() for s in resp.msg.get("WWW-Authenticate", "").split(",")]
            for scheme in schemes:
                if scheme.startswith(auth_scheme):
                    data = decodestring(scheme[len(auth_scheme)+1:])
                    break
            else:
                print "Could not find scheme '%s' in schemes %r" % (auth_scheme, schemes)
                break
        
            resp.read()
    print "Final response status is", resp.status, resp.reason
    if resp.status == 200:
        # Worked!
        # Check we can read it again without re-authenticating.
        if resp.will_close:
            print "EEEK - response will close, but NTLM is per connection - it must stay open"
        body = resp.read()
        if options.show_body:
            print "Final response body:"
            print body
        h.putrequest('GET', url)
        h.endheaders()
        resp = h.getresponse()
        print "Second fetch response is", resp.status, resp.reason
        if options.show_headers:
            print "Second response headers:"
            for name, val in resp.msg.items():
                print " %s: %s" % (name, val)
        
        resp.read(int(resp.msg.get("content-length", 0)))
    elif resp.status == 500:
        print "Error text"
        print resp.read()
    else:
        if options.show_body:
            cl = resp.msg.get("content-length")
            print resp.read(int(cl))

if __name__=='__main__':
    parser = optparse.OptionParser(description=__doc__)
    
    parser.add_option("", "--show-body", action="store_true",
                      help="print the body of each response as it is received")

    parser.add_option("", "--show-headers", action="store_true",
                      help="print the headers of each response as it is received")

    parser.add_option("", "--user", action="store",
                      help="The username to login with")

    parser.add_option("", "--password", action="store",
                      help="The password to login with")

    parser.add_option("", "--domain", action="store",
                      help="The domain to login to")

    options, args = parser.parse_args()
    if not args:
        print "Run with --help for usage details"
        args = ["http://localhost/localstart.asp"]
    for url in args:
        scheme, netloc, path, params, query, fragment = urlparse.urlparse(url)
        if (scheme != "http") or params or query or fragment:
            parser.error("Scheme must be http, URL must be simple")
    
        print "Opening '%s' from '%s'" % (path, netloc)
        r = open_url(netloc, path)