updated with the new version of gp-saml-gui (from upstream)

[nu-vpn-proxy.git] / gp-saml-gui.py

diff --git a/gp-saml-gui.py b/gp-saml-gui.py
index b702d0c51da9e800c57faa4bdd6adc33723e9857..a046e5329e1167c001b07cc14e210f2a9e34da06 100755 (executable)
--- a/gp-saml-gui.py
+++ b/gp-saml-gui.py
@@ -1,43 +1,68 @@
 #!/usr/bin/env python3
 
 #!/usr/bin/env python3
 

+import warnings

 try:
     import gi
 try:
     import gi

+
+    gi.require_version('Gtk', '3.0')
+    try:
+        gi.require_version('WebKit2', '4.1')
+    except ValueError:  # I wish this were ImportError
+        gi.require_version('WebKit2', '4.0')
+        warnings.warn("Using WebKit2Gtk 4.0 (obsolete); please upgrade to WebKit2Gtk 4.1")
+    from gi.repository import Gtk, WebKit2, GLib

 except ImportError:
     try:
         import pgi as gi
 except ImportError:
     try:
         import pgi as gi

+        gi.require_version('Gtk', '3.0')
+        gi.require_version('WebKit2', '4.0')
+        from pgi.repository import Gtk, WebKit2, GLib
+        warnings.warn("Using PGI and WebKit2Gtk 4.0 (both obsolete); please upgrade to PyGObject and WebKit2Gtk 4.1")

     except ImportError:
         gi = None
 if gi is None:
     except ImportError:
         gi = None
 if gi is None:

-    raise ImportError("Either gi (PyGObject) or pgi module is required.")
+    raise ImportError("Either gi (PyGObject) or pgi (obsolete) module is required.")

 
 import argparse
 
 import argparse

-import pprint
-import urllib
+import urllib3

 import requests
 import xml.etree.ElementTree as ET
 import ssl
 import requests
 import xml.etree.ElementTree as ET
 import ssl

+import tempfile

 
 from operator import setitem
 
 from operator import setitem

-from os import path
+from os import path, dup2, execvp, environ

 from shlex import quote
 from sys import stderr, platform
 from binascii import a2b_base64, b2a_base64
 from shlex import quote
 from sys import stderr, platform
 from binascii import a2b_base64, b2a_base64

-from urllib.parse import urlparse, urlencode
+from urllib.parse import urlparse, urlencode, urlunsplit
+from html.parser import HTMLParser
+
+
+class CommentHtmlParser(HTMLParser):
+    def __init__(self):
+        super().__init__()
+        self.comments = []
+
+    def handle_comment(self, data: str) -> None:
+        self.comments.append(data)
+
+
+COOKIE_FIELDS = ('prelogin-cookie', 'portal-userauthcookie')

 
 

-gi.require_version('Gtk', '3.0')
-gi.require_version('WebKit2', '4.0')
-from gi.repository import Gtk, WebKit2, GLib

 
 class SAMLLoginView:
 
 class SAMLLoginView:

-    def __init__(self, uri, html=None, verbose=False, cookies=None, verify=True):
-        window = Gtk.Window()
+    def __init__(self, uri, html, args):
+
+        Gtk.init(None)
+        self.window = window = Gtk.Window()

 
         # API reference: https://lazka.github.io/pgi-docs/#WebKit2-4.0
 
         self.closed = False
         self.success = False
         self.saml_result = {}
 
         # API reference: https://lazka.github.io/pgi-docs/#WebKit2-4.0
 
         self.closed = False
         self.success = False
         self.saml_result = {}

-        self.verbose = verbose
+        self.verbose = args.verbose

 
         self.ctx = WebKit2.WebContext.get_default()
         if not args.verify:
 
         self.ctx = WebKit2.WebContext.get_default()
         if not args.verify:


@@ -48,12 +73,22 @@ class SAMLLoginView:
             self.cookies.set_persistent_storage(args.cookies, WebKit2.CookiePersistentStorage.TEXT)
         self.wview = WebKit2.WebView()
 
             self.cookies.set_persistent_storage(args.cookies, WebKit2.CookiePersistentStorage.TEXT)
         self.wview = WebKit2.WebView()
 

+        if args.no_proxy:
+            data_manager = self.ctx.get_website_data_manager()
+            data_manager.set_network_proxy_settings(WebKit2.NetworkProxyMode.NO_PROXY, None)
+
+        if args.user_agent is None:
+            args.user_agent = 'PAN GlobalProtect'
+        settings = self.wview.get_settings()
+        settings.set_user_agent(args.user_agent)
+        self.wview.set_settings(settings)
+

         window.resize(500, 500)
         window.add(self.wview)
         window.show_all()
         window.set_title("SAML Login")
         window.connect('delete-event', self.close)
         window.resize(500, 500)
         window.add(self.wview)
         window.show_all()
         window.set_title("SAML Login")
         window.connect('delete-event', self.close)

-        self.wview.connect('load-changed', self.get_saml_headers)
+        self.wview.connect('load-changed', self.on_load_changed)

         self.wview.connect('resource-load-started', self.log_resources)
 
         if html:
         self.wview.connect('resource-load-started', self.log_resources)
 
         if html:


@@ -78,7 +113,8 @@ class SAMLLoginView:
         h = rs.get_http_headers() if rs else None
         if h:
             ct, cl = h.get_content_type(), h.get_content_length()
         h = rs.get_http_headers() if rs else None
         if h:
             ct, cl = h.get_content_type(), h.get_content_length()

-            content_type, charset = ct[0], ct.params.get('charset')
+            content_type = ct[0]
+            charset = ct.params.get('charset') if ct.params else None

             content_details = '%d bytes of %s%s for ' % (cl, content_type, ('; charset='+charset) if charset else '')
         print('[RECEIVE] %sresource %s %s' % (content_details if h else '', m, uri), file=stderr)
 
             content_details = '%d bytes of %s%s for ' % (cl, content_type, ('; charset='+charset) if charset else '')
         print('[RECEIVE] %sresource %s %s' % (content_details if h else '', m, uri), file=stderr)
 


@@ -93,42 +129,133 @@ class SAMLLoginView:
         if charset or content_type.startswith('text/'):
             print(data.decode(charset or 'utf-8'), file=stderr)
 
         if charset or content_type.startswith('text/'):
             print(data.decode(charset or 'utf-8'), file=stderr)
 

-    def get_saml_headers(self, webview, event):
+    def on_load_changed(self, webview, event):

         if event != WebKit2.LoadEvent.FINISHED:
             return
 
         mr = webview.get_main_resource()
         uri = mr.get_uri()
         rs = mr.get_response()
         if event != WebKit2.LoadEvent.FINISHED:
             return
 
         mr = webview.get_main_resource()
         uri = mr.get_uri()
         rs = mr.get_response()

-        h = rs.get_http_headers()
+        h = rs.get_http_headers() if rs else None
+        ct = h.get_content_type() if h else None
+

         if self.verbose:
             print('[PAGE   ] Finished loading page %s' % uri, file=stderr)
         if self.verbose:
             print('[PAGE   ] Finished loading page %s' % uri, file=stderr)

-        if not h:
+        urip = urlparse(uri)
+        origin = '%s %s' % ('🔒' if urip.scheme == 'https' else '🔴', urip.netloc)
+        self.window.set_title("SAML Login (%s)" % origin)
+
+        # if no response or no headers (for e.g. about:blank), skip checking this
+        if not rs or not h:

             return
 
         # convert to normal dict
         d = {}
             return
 
         # convert to normal dict
         d = {}

-        h.foreach(lambda k, v: setitem(d, k, v))
+        h.foreach(lambda k, v: setitem(d, k.lower(), v))

         # filter to interesting headers
         # filter to interesting headers

-        fd = {name:v for name, v in d.items() if name.startswith('saml-') or name in ('prelogin-cookie', 'portal-userauthcookie')}
-        if fd and self.verbose:
-            print("[SAML   ] Got SAML result headers: %r" % fd, file=stderr)
+        fd = {name: v for name, v in d.items() if name.startswith('saml-') or name in COOKIE_FIELDS}
+
+        if fd:
+            if self.verbose:
+                print("[SAML   ] Got SAML result headers: %r" % fd, file=stderr)
+                if self.verbose > 1:
+                    # display everything we found
+                    mr.get_data(None, self.log_resource_text, ct[0], ct.params.get('charset'), d)
+            self.saml_result.update(fd, server=urlparse(uri).netloc)
+            self.check_done()
+
+        if not self.success:
+            if self.verbose > 1:
+                print("[SAML   ] No headers in response, searching body for xml comments", file=stderr)
+            # asynchronous call to fetch body content, continue processing in callback:
+            mr.get_data(None, self.response_callback, ct)
+
+    def response_callback(self, resource, result, ct):
+        data = resource.get_data_finish(result)
+        content = data.decode(ct.params.get("charset") or "utf-8")
+
+        html_parser = CommentHtmlParser()
+        html_parser.feed(content)
+
+        fd = {}
+        for comment in html_parser.comments:

             if self.verbose > 1:
             if self.verbose > 1:

-                # display everything we found
-                ct = h.get_content_type()
-                mr.get_data(None, self.log_resource_text, ct[0], ct.params.get('charset'), d)
+                print("[SAML   ] Found comment in response body: '%s'" % comment, file=stderr)
+            try:
+                # xml parser requires valid xml with a single root tag, but our expected content
+                # is just a list of data tags, so we need to improvise
+                xmlroot = ET.fromstring("<fakexmlroot>%s</fakexmlroot>" % comment)
+                # search for any valid first level xml tags (inside our fake root) that could contain SAML data
+                for elem in xmlroot:
+                    if elem.tag.startswith("saml-") or elem.tag in COOKIE_FIELDS:
+                        fd[elem.tag] = elem.text
+            except ET.ParseError:
+                pass  # silently ignore any comments that don't contain valid xml

 
 

-        # check if we're done
-        self.saml_result.update(fd, server=urlparse(uri).netloc)
-        GLib.timeout_add(1000, self.check_done)
+        if self.verbose > 1:
+            print("[SAML   ] Finished parsing response body for %s" % resource.get_uri(), file=stderr)
+        if fd:
+            if self.verbose:
+                print("[SAML   ] Got SAML result tags: %s" % fd, file=stderr)
+            self.saml_result.update(fd, server=urlparse(resource.get_uri()).netloc)
+
+        if not self.check_done():
+            # Work around timing/race condition by retrying check_done after 1 second
+            GLib.timeout_add(1000, self.check_done)

 
     def check_done(self):
         d = self.saml_result
         if 'saml-username' in d and ('prelogin-cookie' in d or 'portal-userauthcookie' in d):
 
     def check_done(self):
         d = self.saml_result
         if 'saml-username' in d and ('prelogin-cookie' in d or 'portal-userauthcookie' in d):

-            if args.verbose:
+            if self.verbose:

                 print("[SAML   ] Got all required SAML headers, done.", file=stderr)
             self.success = True
             Gtk.main_quit()
                 print("[SAML   ] Got all required SAML headers, done.", file=stderr)
             self.success = True
             Gtk.main_quit()

+            return True
+
+
+class TLSAdapter(requests.adapters.HTTPAdapter):
+    '''Adapt to older TLS stacks that would raise errors otherwise.
+
+    We try to work around different issues:
+    * Enable weak ciphers such as 3DES or RC4, that have been disabled by default
+      in OpenSSL 3.0 or recent Linux distributions.
+    * Enable weak Diffie-Hellman key exchange sizes.
+    * Enable unsafe legacy renegotiation for servers without RFC 5746 support.
+
+    See Also
+    --------
+    https://github.com/psf/requests/issues/4775#issuecomment-478198879
+
+    Notes
+    -----
+    Python is missing an ssl.OP_LEGACY_SERVER_CONNECT constant.
+    We have extracted the relevant value from <openssl/ssl.h>.
+
+    '''
+
+    def __init__(self, verify=True):
+        self.verify = verify
+        super().__init__()
+
+    def init_poolmanager(self, connections, maxsize, block=False):
+        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+        ssl_context.set_ciphers('DEFAULT:@SECLEVEL=1')
+        ssl_context.options |= 1<<2  # OP_LEGACY_SERVER_CONNECT
+
+        if not self.verify:
+            ssl_context.check_hostname = False
+            ssl_context.verify_mode = ssl.CERT_NONE
+
+        if hasattr(ssl_context, "keylog_filename"):
+            sslkeylogfile = environ.get("SSLKEYLOGFILE")
+            if sslkeylogfile:
+                ssl_context.keylog_filename = sslkeylogfile
+
+        self.poolmanager = urllib3.PoolManager(
+                num_pools=connections,
+                maxsize=maxsize,
+                block=block,
+                ssl_context=ssl_context)

 
 def parse_args(args = None):
     pf2clientos = dict(linux='Linux', darwin='Mac', win32='Windows', cygwin='Windows')
 
 def parse_args(args = None):
     pf2clientos = dict(linux='Linux', darwin='Mac', win32='Windows', cygwin='Windows')


@@ -144,10 +271,11 @@ def parse_args(args = None):
     x.add_argument('-K', '--no-cookies', dest='cookies', action='store_const', const=None,
                    help="Don't use or store cookies at all")
     x = p.add_mutually_exclusive_group()
     x.add_argument('-K', '--no-cookies', dest='cookies', action='store_const', const=None,
                    help="Don't use or store cookies at all")
     x = p.add_mutually_exclusive_group()

-    x.add_argument('-p','--portal', dest='interface', action='store_const', const='portal', default='gateway',
-                   help='SAML auth to portal')
-    x.add_argument('-g','--gateway', dest='interface', action='store_const', const='gateway',
-                   help='SAML auth to gateway (default)')
+    p.add_argument('-i', '--ignore-redirects', action='store_true', help='Use specified gateway hostname as server, ignoring redirects')
+    x.add_argument('-g','--gateway', dest='interface', action='store_const', const='gateway', default='portal',
+                   help='SAML auth to gateway')
+    x.add_argument('-p','--portal', dest='interface', action='store_const', const='portal',
+                   help='SAML auth to portal (default)')

     g = p.add_argument_group('Client certificate')
     g.add_argument('-c','--cert', help='PEM file containing client certificate (and optionally private key)')
     g.add_argument('--key', help='PEM file containing client private key (if not included in same file as certificate)')
     g = p.add_argument_group('Client certificate')
     g.add_argument('-c','--cert', help='PEM file containing client certificate (and optionally private key)')
     g.add_argument('--key', help='PEM file containing client private key (if not included in same file as certificate)')


@@ -155,11 +283,22 @@ def parse_args(args = None):
     x = p.add_mutually_exclusive_group()
     x.add_argument('-v','--verbose', default=1, action='count', help='Increase verbosity of explanatory output to stderr')
     x.add_argument('-q','--quiet', dest='verbose', action='store_const', const=0, help='Reduce verbosity to a minimum')
     x = p.add_mutually_exclusive_group()
     x.add_argument('-v','--verbose', default=1, action='count', help='Increase verbosity of explanatory output to stderr')
     x.add_argument('-q','--quiet', dest='verbose', action='store_const', const=0, help='Reduce verbosity to a minimum')

-    g.add_argument('-x','--external', action='store_true', help='Launch external browser (for debugging)')
+    x = p.add_mutually_exclusive_group()
+    x.add_argument('-x','--external', action='store_true', help='Launch external browser (for debugging)')
+    x.add_argument('-P','--pkexec-openconnect', action='store_const', dest='exec', const='pkexec', help='Use PolicyKit to exec openconnect')
+    x.add_argument('-S','--sudo-openconnect', action='store_const', dest='exec', const='sudo', help='Use sudo to exec openconnect')
+    x.add_argument('-E','--exec-openconnect', action='store_const', dest='exec', const='exec', help='Execute openconnect directly (advanced users)')

     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(pf2clientos.values()), default=default_clientos, help="clientos value to send (default is %(default)s)")
     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(pf2clientos.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)
+    p.add_argument('-f','--field', dest='extra', action='append', default=[],
+                   help='Extra form field(s) to pass to include in the login query string (e.g. "-f magic-cookie-value=deadbeef01234567")')
+    p.add_argument('--allow-insecure-crypto', dest='insecure', action='store_true',
+                   help='Allow use of insecure renegotiation or ancient 3DES and RC4 ciphers')
+    p.add_argument('--user-agent', '--useragent', default='PAN GlobalProtect',
+                   help='Use the provided string as the HTTP User-Agent header (default is %(default)r, as used by OpenConnect)')
+    p.add_argument('--no-proxy', action='store_true', help='Disable system proxy settings')
+    p.add_argument('openconnect_extra', nargs='*', help="Extra arguments to include in output OpenConnect command-line")
+    args = p.parse_args(args)

 
     args.ocos = clientos2ocos[args.clientos]
     args.extra = dict(x.split('=', 1) for x in args.extra)
 
     args.ocos = clientos2ocos[args.clientos]
     args.extra = dict(x.split('=', 1) for x in args.extra)


@@ -178,11 +317,13 @@ def parse_args(args = None):
 
     return p, args
 
 
     return p, args
 

-if __name__ == "__main__":
-    p, args = parse_args()
+def main(args = None):
+    p, args = parse_args(args)

 
     s = requests.Session()
 
     s = requests.Session()

-    s.headers['User-Agent'] = 'PAN GlobalProtect'
+    if args.insecure:
+        s.mount('https://', TLSAdapter(verify=args.verify))
+    s.headers['User-Agent'] = 'PAN GlobalProtect' if args.user_agent is None else args.user_agent

     s.cert = args.cert
 
     if2prelogin = {'portal':'global-protect/prelogin.esp','gateway':'ssl-vpn/prelogin.esp'}
     s.cert = args.cert
 
     if2prelogin = {'portal':'global-protect/prelogin.esp','gateway':'ssl-vpn/prelogin.esp'}


@@ -193,7 +334,7 @@ if __name__ == "__main__":
         sam, uri, html = 'URI', args.server, None
     else:
         endpoint = 'https://{}/{}'.format(args.server, if2prelogin[args.interface])
         sam, uri, html = 'URI', args.server, None
     else:
         endpoint = 'https://{}/{}'.format(args.server, if2prelogin[args.interface])

-        data = {'tmp':'tmp', 'kerberos-support':'yes', 'ipv6-support':'no', 'clientVer':4100, 'clientos':args.clientos, **args.extra}
+        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:
         if args.verbose:
             print("Looking for SAML auth tags in response to %s..." % endpoint, file=stderr)
         try:


@@ -209,12 +350,20 @@ if __name__ == "__main__":
             if isinstance(rootex, ssl.CertificateError):
                 p.error("SSL certificate error (try --no-verify to ignore): %s" % rootex)
             elif isinstance(rootex, ssl.SSLError):
             if isinstance(rootex, ssl.CertificateError):
                 p.error("SSL certificate error (try --no-verify to ignore): %s" % rootex)
             elif isinstance(rootex, ssl.SSLError):

-                p.error("SSL error: %s" % rootex)
+                p.error("SSL error (try --allow-insecure-crypto to ignore): %s" % rootex)

             else:
                 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, urlencode(data)))
             else:
                 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, urlencode(data)))

+        status = xml.find('status')
+        if status != None and status.text != 'Success':
+            msg = xml.find('msg')
+            if msg != None and msg.text == 'GlobalProtect {} does not exist'.format(args.interface):
+                p.error("{} interface does not exist; specify {} instead".format(
+                    args.interface.title(), '--portal' if args.interface=='gateway' else '--gateway'))
+            else:
+                p.error("Error in {} prelogin response: {}".format(args.interface, msg.text))

         sam = xml.find('saml-auth-method')
         sr = xml.find('saml-request')
         if sam is None or sr is None:
         sam = xml.find('saml-auth-method')
         sr = xml.find('saml-request')
         if sam is None or sr is None:


@@ -243,7 +392,7 @@ if __name__ == "__main__":
     # spawn WebKit view to do SAML interactive login
     if args.verbose:
         print("Got SAML %s, opening browser..." % sam, file=stderr)
     # spawn WebKit view to do SAML interactive login
     if args.verbose:
         print("Got SAML %s, opening browser..." % sam, file=stderr)

-    slv = SAMLLoginView(uri, html, verbose=args.verbose, cookies=args.cookies, verify=args.verify)
+    slv = SAMLLoginView(uri, html, args)

     Gtk.main()
     if slv.closed:
         print("Login window closed by user.", file=stderr)
     Gtk.main()
     if slv.closed:
         print("Login window closed by user.", file=stderr)


@@ -253,7 +402,10 @@ if __name__ == "__main__":
 
     # extract response and convert to OpenConnect command-line
     un = slv.saml_result.get('saml-username')
 
     # extract response and convert to OpenConnect command-line
     un = slv.saml_result.get('saml-username')

-    server = slv.saml_result.get('server', args.server)
+    if args.ignore_redirects:
+        server = args.server
+    else:
+        server = slv.saml_result.get('server', args.server)

 
     for cn, ifh in (('prelogin-cookie','gateway'), ('portal-userauthcookie','portal')):
         cv = slv.saml_result.get(cn)
 
     for cn, ifh in (('prelogin-cookie','gateway'), ('portal-userauthcookie','portal')):
         cv = slv.saml_result.get(cn)


@@ -263,25 +415,75 @@ if __name__ == "__main__":
         cn = ifh = None
         p.error("Didn't get an expected cookie. Something went wrong.")
 
         cn = ifh = None
         p.error("Didn't get an expected cookie. Something went wrong.")
 

+    urlpath = args.interface + ":" + cn
+    openconnect_args = [
+        "--protocol=gp",
+        "--user="+un,
+        "--os="+args.ocos,
+        "--usergroup="+urlpath,
+        "--passwd-on-stdin",
+        server
+    ] + args.openconnect_extra
+
+    if args.insecure:
+        openconnect_args.insert(1, "--allow-insecure-crypto")
+    if args.user_agent:
+        openconnect_args.insert(1, "--useragent="+args.user_agent)
+    if args.cert:
+        cert, key = args.cert
+        if key:
+            openconnect_args.insert(1, "--sslkey="+key)
+        openconnect_args.insert(1, "--certificate="+cert)
+    if args.no_proxy:
+        openconnect_args.insert(1, "--no-proxy")
+
+    openconnect_command = '''    echo {} |\n        sudo openconnect {}'''.format(
+        quote(cv), " ".join(map(quote, openconnect_args)))
+

     if args.verbose:
         # Warn about ambiguities
         if server != args.server and not args.uri:
     if args.verbose:
         # Warn about ambiguities
         if server != args.server and not args.uri:

-            print('''IMPORTANT: During the SAML auth, you were redirected from {0} to {1}. This probably '''
-                  '''means you should specify {1} as the server for final connection, but we're not 100% '''
-                  '''sure about this. You should probably try both.\n'''.format(args.server, server), file=stderr)
+            if args.ignore_redirects:
+                print('''IMPORTANT: During the SAML auth, you were redirected from {0} to {1}. This probably '''
+                      '''means you should specify {1} as the server for final connection, but we're not 100% '''
+                      '''sure about this. You should probably try both; if necessary, use the '''
+                      '''--ignore-redirects option to specify desired behavior.\n'''.format(args.server, server), file=stderr)
+            else:
+                print('''IMPORTANT: During the SAML auth, you were redirected from {0} to {1}, however the '''
+                      '''redirection was ignored because you specified --ignore-redirects.\n'''.format(args.server, server), file=stderr)

         if ifh != args.interface and not args.uri:
             print('''IMPORTANT: We started with SAML auth to the {} interface, but received a cookie '''
                   '''that's often associated with the {} interface. You should probably try both.\n'''.format(args.interface, ifh),
                   file=stderr)
         print('''\nSAML response converted to OpenConnect command line invocation:\n''', file=stderr)
         if ifh != args.interface and not args.uri:
             print('''IMPORTANT: We started with SAML auth to the {} interface, but received a cookie '''
                   '''that's often associated with the {} interface. You should probably try both.\n'''.format(args.interface, ifh),
                   file=stderr)
         print('''\nSAML response converted to OpenConnect command line invocation:\n''', file=stderr)

-        print('''    echo {} |\n        openconnect --protocol=gp --user={} --os={} --usergroup={}:{} --passwd-on-stdin {}'''.format(
-            quote(cv), quote(un), quote(args.ocos), quote(args.interface), quote(cn), quote(server)), file=stderr)
+        print(openconnect_command, file=stderr)

 
         print('''\nSAML response converted to test-globalprotect-login.py invocation:\n''', file=stderr)
         print('''    test-globalprotect-login.py --user={} --clientos={} -p '' \\\n         https://{}/{} {}={}\n'''.format(
             quote(un), quote(args.clientos), quote(server), quote(if2auth[args.interface]), quote(cn), quote(cv)), file=stderr)
 
         print('''\nSAML response converted to test-globalprotect-login.py invocation:\n''', file=stderr)
         print('''    test-globalprotect-login.py --user={} --clientos={} -p '' \\\n         https://{}/{} {}={}\n'''.format(
             quote(un), quote(args.clientos), quote(server), quote(if2auth[args.interface]), quote(cn), quote(cv)), file=stderr)

-    varvals = {
-        'HOST': quote('https://%s/%s:%s' % (server, if2auth[args.interface], cn)),
-        'USER': quote(un), 'COOKIE': quote(cv), 'OS': quote(args.ocos),
-    }
-    print('\n'.join('%s=%s' % pair for pair in varvals.items()))
+
+    if args.exec:
+        print('''Launching OpenConnect with {}, equivalent to:\n{}'''.format(args.exec, openconnect_command), file=stderr)
+        with tempfile.TemporaryFile('w+') as tf:
+            tf.write(cv)
+            tf.flush()
+            tf.seek(0)
+            # redirect stdin from this file, before it is closed by the context manager
+            # (it will remain accessible via the open file descriptor)
+            dup2(tf.fileno(), 0)
+        cmd = ["openconnect"] + openconnect_args
+        if args.exec == 'pkexec':
+            cmd = ["pkexec", "--user", "root"] + cmd
+        elif args.exec == 'sudo':
+            cmd = ["sudo"] + cmd
+        execvp(cmd[0], cmd)
+
+    else:
+        varvals = {
+            'HOST': quote('https://%s/%s' % (server, urlpath)),
+            'USER': quote(un), 'COOKIE': quote(cv), 'OS': quote(args.ocos),
+        }
+        print('\n'.join('%s=%s' % pair for pair in varvals.items()))
+
+if __name__ == "__main__":
+    main()