Add --win-sso option (needs optional dependencies)

setup.py

@@ -84,5 +84,8 @@ def get_version(rel_path):
     },
 
     zip_safe=False,
+    extras_require={
+        'win-sso': ['requests_negotiate_sspi'],
+    },
     python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*',
 )

src/pip/_internal/cli/cmdoptions.py

@@ -930,6 +930,16 @@ def check_list_path_option(options):
 )  # type: Callable[..., Option]
 
 
+win_sso = partial(
+    Option,
+    '--win-sso',
+    dest='win_sso',
+    action='store_true',
+    default=False,
+    help='Similar to the -UseDefaultCredentials parameter '
+         'of the Invoke-WebRequest cmdlet in PowerSheell.')
+
+
 ##########
 # groups #
 ##########
@@ -959,6 +969,7 @@ def check_list_path_option(options):
         no_color,
         no_python_version_warning,
         unstable_feature,
+        win_sso,
     ]
 }  # type: Dict[str, Any]
 

src/pip/_internal/cli/req_command.py

@@ -121,6 +121,10 @@ def _build_session(self, options, retries=None, timeout=None):
                 "https": options.proxy,
             }
 
+        if options.win_sso:
+            from requests_negotiate_sspi import HttpNegotiateAuth
+            session.auth = HttpNegotiateAuth()
+
         # Determine if we can prompt the user for authentication or not
         session.auth.prompting = not options.no_input