mirror of
https://github.com/pgadmin-org/pgadmin4.git
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284 lines
10 KiB
Python
284 lines
10 KiB
Python
##########################################################################
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#
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# pgAdmin 4 - PostgreSQL Tools
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#
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# Copyright (C) 2013 - 2022, The pgAdmin Development Team
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# This software is released under the PostgreSQL Licence
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#
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##########################################################################
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"""A blueprint module implementing the Spnego/Kerberos authentication."""
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import base64
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from os import environ, path, remove
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from werkzeug.datastructures import Headers, MultiDict
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from flask_babel import gettext
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from flask import request, Response, session,\
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current_app, render_template, flash, url_for
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from flask_security.views import _security
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from flask_security.utils import logout_user
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from flask_security import login_required
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import config
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from pgadmin.model import User
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from pgadmin.tools.user_management import create_user
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from pgadmin.utils.constants import KERBEROS
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from pgadmin.utils import PgAdminModule
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from pgadmin.utils.ajax import make_json_response, internal_server_error
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from pgadmin.authenticate.internal import BaseAuthentication
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from pgadmin.authenticate import get_auth_sources
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from pgadmin.utils.csrf import pgCSRFProtect
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try:
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import gssapi
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KERBEROS_AUTH_AVAILABLE = True
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except ImportError:
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# Do not fail at this time, as this could be a desktop mode.
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# Instead throw the runtime error, when the server attempts
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# to use this authentication method.
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KERBEROS_AUTH_AVAILABLE = False
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except OSError:
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# On Windows, it fails with OSError, when KFW libraries not found.
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# Instead throw the runtime error, when the server attempts
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# to use this authentication method.
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KERBEROS_AUTH_AVAILABLE = False
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# Set the Kerberos config file
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if config.KRB_KTNAME and config.KRB_KTNAME != '<KRB5_KEYTAB_FILE>':
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environ['KRB5_KTNAME'] = config.KRB_KTNAME
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class KerberosModule(PgAdminModule):
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def register(self, app, options):
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# Do not look for the sub_modules,
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# instead call blueprint.register(...) directly
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super(PgAdminModule, self).register(app, options)
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def get_exposed_url_endpoints(self):
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return ['kerberos.login',
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'kerberos.logout',
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'kerberos.update_ticket',
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'kerberos.validate_ticket']
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def init_app(app):
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MODULE_NAME = 'kerberos'
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blueprint = KerberosModule(MODULE_NAME, __name__, static_url_path='')
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@blueprint.route("/login",
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endpoint="login", methods=["GET"])
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@pgCSRFProtect.exempt
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def kerberos_login():
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logout_user()
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return Response(render_template("browser/kerberos_login.html",
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login_url=url_for('security.login'),
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))
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@blueprint.route("/logout",
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endpoint="logout", methods=["GET"])
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@pgCSRFProtect.exempt
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def kerberos_logout():
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logout_user()
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if 'KRB5CCNAME' in session:
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# Remove the credential cache
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cache_file_path = session['KRB5CCNAME'].split(":")[1]
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if path.exists(cache_file_path):
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remove(cache_file_path)
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return Response(render_template("browser/kerberos_logout.html",
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login_url=url_for('security.login'),
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))
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@blueprint.route("/update_ticket",
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endpoint="update_ticket", methods=["GET"])
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@pgCSRFProtect.exempt
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@login_required
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def kerberos_update_ticket():
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"""
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Update the kerberos ticket.
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"""
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from werkzeug.datastructures import Headers
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headers = Headers()
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authorization = request.headers.get("Authorization", None)
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if authorization is None:
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# Send the Negotiate header to the client
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# if Kerberos ticket is not found.
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headers.add('WWW-Authenticate', 'Negotiate')
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return Response("Unauthorised", 401, headers)
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else:
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source = get_auth_sources(KERBEROS)
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auth_header = authorization.split()
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in_token = auth_header[1]
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# Validate the Kerberos ticket
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status, context = source.negotiate_start(in_token)
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if status:
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return Response("Ticket updated successfully.")
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return Response(context, 500)
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@blueprint.route("/validate_ticket",
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endpoint="validate_ticket", methods=["GET"])
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@pgCSRFProtect.exempt
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@login_required
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def kerberos_validate_ticket():
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"""
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Return the kerberos ticket lifetime left after getting the
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ticket from the credential cache
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"""
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import gssapi
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try:
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del_creds = gssapi.Credentials(store={
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'ccache': session['KRB5CCNAME']})
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creds = del_creds.acquire(store={'ccache': session['KRB5CCNAME']})
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except Exception as e:
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current_app.logger.exception(e)
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return internal_server_error(errormsg=str(e))
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return make_json_response(
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data={'ticket_lifetime': creds.lifetime},
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status=200
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)
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app.register_blueprint(blueprint)
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class KerberosAuthentication(BaseAuthentication):
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LOGIN_VIEW = 'kerberos.login'
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LOGOUT_VIEW = 'kerberos.logout'
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def get_source_name(self):
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return KERBEROS
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def get_friendly_name(self):
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return gettext("kerberos")
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def validate(self, form):
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return True
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def authenticate(self, frm):
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if KERBEROS_AUTH_AVAILABLE is not True:
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raise RuntimeError(gettext(
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"Kerberos authentication can't be used as"
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" GSSAPI module couldn't be loaded."
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))
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retval = [True, None]
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negotiate = False
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headers = Headers()
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authorization = request.headers.get("Authorization", None)
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form_class = _security.login_form
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if request.json:
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form = form_class(MultiDict(request.json))
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else:
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form = form_class()
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try:
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if authorization is not None:
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auth_header = authorization.split()
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if auth_header[0] == 'Negotiate':
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status, negotiate = self.negotiate_start(auth_header[1])
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if status:
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# Saving the first 15 characters of the kerberos key
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# to encrypt/decrypt database password
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session['pass_enc_key'] = auth_header[1][0:15]
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# Create user
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retval = self.__auto_create_user(
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str(negotiate.initiator_name))
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elif isinstance(negotiate, Exception):
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flash(gettext(negotiate), 'danger')
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retval = [status,
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Response(render_template(
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"security/login_user.html",
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login_user_form=form))]
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else:
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headers.add('WWW-Authenticate', 'Negotiate ' +
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str(base64.b64encode(negotiate), 'utf-8'))
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return False, Response("Success", 200, headers)
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else:
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flash(gettext("Kerberos authentication failed."
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" Couldn't find kerberos ticket."), 'danger')
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headers.add('WWW-Authenticate', 'Negotiate')
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retval = [False,
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Response(render_template(
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"security/login_user.html",
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login_user_form=form), 401, headers)]
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finally:
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if negotiate is not False:
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self.negotiate_end(negotiate)
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return retval
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def negotiate_start(self, in_token):
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svc_princ = gssapi.Name('HTTP@%s' % config.KRB_APP_HOST_NAME,
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name_type=gssapi.NameType.hostbased_service)
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cname = svc_princ.canonicalize(gssapi.MechType.kerberos)
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try:
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server_creds = gssapi.Credentials(usage='accept', name=cname)
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context = gssapi.SecurityContext(creds=server_creds)
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out_token = context.step(base64.b64decode(in_token))
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except Exception as e:
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current_app.logger.exception(e)
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return False, e
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if out_token and not context.complete:
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return False, out_token
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if context.complete:
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deleg_creds = context.delegated_creds
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if not hasattr(deleg_creds, 'name'):
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error_msg = gettext('Delegated credentials not supplied.')
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current_app.logger.error(error_msg)
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return False, Exception(error_msg)
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try:
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cache_file_path = path.join(
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config.KERBEROS_CCACHE_DIR, 'pgadmin_cache_{0}'.format(
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deleg_creds.name)
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)
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CCACHE = 'FILE:{0}'.format(cache_file_path)
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store = {'ccache': CCACHE}
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deleg_creds.store(store, overwrite=True, set_default=True)
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session['KRB5CCNAME'] = CCACHE
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except Exception as e:
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current_app.logger.exception(e)
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return False, e
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return True, context
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else:
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return False, None
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def negotiate_end(self, context):
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# Free Delegated Credentials
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del_creds = getattr(context, 'delegated_creds', None)
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if del_creds:
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deleg_creds = context.delegated_creds
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del(deleg_creds)
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def __auto_create_user(self, username):
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"""Add the kerberos user to the internal SQLite database."""
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username = str(username)
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if config.KRB_AUTO_CREATE_USER:
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user = User.query.filter_by(
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username=username, auth_source=KERBEROS).first()
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if user is None:
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return create_user({
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'username': username,
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'email': username,
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'role': 2,
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'active': True,
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'auth_source': KERBEROS
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})
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return True, {'username': username}
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