From: Daniel Lenski Date: Tue, 17 Mar 2020 22:54:48 +0000 (-0700) Subject: include clientos in prelogin.esp parameters (ping #6) X-Git-Url: https://code.communitydata.science/nu-vpn-proxy.git/commitdiff_plain/2cf05074ccc024726b28798ed58447a1321ec0f3?ds=inline include clientos in prelogin.esp parameters (ping #6) Apparently, it affects whether the prelogin.esp response contains SAML tags in some cases. (see https://github.com/dlenski/gp-saml-gui/issues/6#issuecomment-599743060) This fits in with a long line of mystifying issues caused by GlobalProtect servers silently handling different `clientos` values in stupidly different ways. (see https://gitlab.com/openconnect/openconnect/-/merge_requests/17) --- diff --git a/gp-saml-gui.py b/gp-saml-gui.py index 0f2f961..a49a751 100755 --- a/gp-saml-gui.py +++ b/gp-saml-gui.py @@ -11,9 +11,9 @@ import ssl from operator import setitem from os import path from shlex import quote -from sys import stderr +from sys import stderr, platform from binascii import a2b_base64, b2a_base64 -from urllib.parse import urlparse +from urllib.parse import urlparse, urlencode gi.require_version('Gtk', '3.0') gi.require_version('WebKit2', '4.0') @@ -122,6 +122,9 @@ class SAMLLoginView: Gtk.main_quit() def parse_args(args = None): + clientos_map = dict(linux='Linux', darwin='Mac', win32='Windows', cygwin='Windows') + default_clientos = clientos_map.get(platform, 'Windows') + p = argparse.ArgumentParser() p.add_argument('server', help='GlobalProtect server (portal or gateway)') p.add_argument('--no-verify', dest='verify', action='store_false', default=True, help='Ignore invalid server certificate') @@ -142,6 +145,7 @@ def parse_args(args = None): g.add_argument('-v','--verbose', default=0, action='count') g.add_argument('-x','--external', action='store_true', help='Launch external browser (for debugging)') g.add_argument('-u','--uri', action='store_true', help='Treat server as the complete URI of the SAML entry point, rather than GlobalProtect server') + g.add_argument('--clientos', choices=set(clientos_map.values()), default=default_clientos, help="clientos value to send (default is %(default)s)") p.add_argument('extra', nargs='*', help='Extra form field(s) to pass to include in the login query string (e.g. "magic-cookie-value=deadbeef01234567")') args = p.parse_args(args = None) @@ -176,10 +180,11 @@ if __name__ == "__main__": sam, uri, html = 'URI', args.server, None else: endpoint = 'https://{}/{}'.format(args.server, if2prelogin[args.interface]) + data = {'tmp':'tmp', 'kerberos-support':'yes', 'ipv6-support':'yes', 'clientVer':4100, 'clientos':args.clientos, **args.extra} if args.verbose: print("Looking for SAML auth tags in response to %s..." % endpoint, file=stderr) try: - res = s.post(endpoint, verify=args.verify, data=args.extra) + res = s.post(endpoint, verify=args.verify, data=data) except Exception as ex: rootex = ex while True: @@ -196,12 +201,14 @@ if __name__ == "__main__": raise xml = ET.fromstring(res.content) if xml.tag != 'prelogin-response': - p.error("This does not appear to be a GlobalProtect prelogin response\nCheck in browser: {}".format(endpoint)) + p.error("This does not appear to be a GlobalProtect prelogin response\nCheck in browser: {}?{}".format(endpoint, urlencode(data))) sam = xml.find('saml-auth-method') sr = xml.find('saml-request') if sam is None or sr is None: - p.error("This does not appear to be a SAML prelogin response ( or tags missing)\n" - "Check in browser: {}".format(endpoint)) + p.error("{} prelogin response does not contain SAML tags ( or missing)\n\n" + "Things to try:\n" + "1) Spoof an officially supported OS (e.g. --clientos=Windows or --clientos=Mac)\n" + "2) Check in browser: {}?{}".format(args.interface.title(), endpoint, urlencode(data))) sam = sam.text sr = a2b_base64(sr.text).decode() if sam == 'POST': diff --git a/test-globalprotect-login.py b/test-globalprotect-login.py index a4b453f..81ae8b7 100755 --- a/test-globalprotect-login.py +++ b/test-globalprotect-login.py @@ -1,7 +1,7 @@ #!/usr/bin/python3 from __future__ import print_function -from sys import stderr, version_info +from sys import stderr, version_info, platform if (version_info >= (3, 0)): from urllib.parse import urlparse, urlencode raw_input = input @@ -18,15 +18,19 @@ from binascii import a2b_base64 from tempfile import NamedTemporaryFile from shlex import quote +clientos_map = dict(linux='Linux', darwin='Mac', win32='Windows', cygwin='Windows') +default_clientos = clientos_map.get(platform, 'Windows') + p = argparse.ArgumentParser() p.add_argument('-v','--verbose', default=0, action='count') -p.add_argument('endpoint', help='GlobalProtect server; can append /ssl-vpn/login.esp (default) or /global-protect/getconfig.esp') +p.add_argument('endpoint', help='GlobalProtect server; can append /ssl-vpn/login.esp (default) or /global-protect/getconfig.esp or /{ssl-vpn,global-protect}/prelogin.esp') p.add_argument('extra', nargs='*', help='Extra field to pass to include in the login query string (e.g. "portal-userauthcookie=deadbeef01234567")') g = p.add_argument_group('Login credentials') g.add_argument('-u','--user', help='Username (will prompt if unspecified)') g.add_argument('-p','--password', help='Password (will prompt if unspecified)') g.add_argument('-c','--cert', help='PEM file containing client certificate (and optionally private key)') g.add_argument('--computer', default=os.uname()[1], help="Computer name (default is `hostname`)") +g.add_argument('--clientos', choices=set(clientos_map.values()), default=default_clientos, help="clientos value to send (default is %(default)s)") g.add_argument('--key', help='PEM file containing client private key (if not included in same file as certificate)') p.add_argument('-b','--browse', action='store_true', help='Automatically spawn browser for SAML') p.add_argument('--no-verify', dest='verify', action='store_false', default=True, help='Ignore invalid server certificate') @@ -53,7 +57,13 @@ s.headers['User-Agent'] = 'PAN GlobalProtect' s.cert = cert if prelogin: - data = extra + data={ + # sent by many clients but not known to have any effect + 'tmp': 'tmp', 'clientVer': 4100, 'kerberos-support': 'yes', 'ipv6-support': 'yes', + # affects some clients' behavior (https://github.com/dlenski/gp-saml-gui/issues/6#issuecomment-599743060) + 'clientos': args.clientos, + **extra + } else: # same request params work for /global-protect/getconfig.esp as for /ssl-vpn/login.esp if args.user == None: