236 lines
7.3 KiB
Python
236 lines
7.3 KiB
Python
import json
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import connexion
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import flask
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from flask import redirect, g, request
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from crc import app, db
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from crc.api.common import ApiError
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from crc.models.user import UserModel, UserModelSchema
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from crc.services.ldap_service import LdapService, LdapUserInfo
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from crc.services.approval_service import ApprovalService
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"""
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.. module:: crc.api.user
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:synopsis: Single Sign On (SSO) user login and session handlers
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"""
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def verify_token(token=None):
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"""
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Verifies the token for the user (if provided). If in production environment and token is not provided,
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gets user from the SSO headers and returns their token.
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Args:
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token: Optional[str]
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Returns:
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token: str
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Raises:
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ApiError. If not on production and token is not valid, returns an 'invalid_token' 403 error.
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If on production and user is not authenticated, returns a 'no_user' 403 error.
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"""
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print('=== verify_token ===')
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print('_is_production()', _is_production())
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failure_error = ApiError("invalid_token", "Unable to decode the token you provided. Please re-authenticate", status_code=403)
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if not _is_production():
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g.user = UserModel.query.first()
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token = g.user.encode_auth_token()
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if token:
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try:
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token_info = UserModel.decode_auth_token(token)
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g.user = UserModel.query.filter_by(uid=token_info['sub']).first()
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except:
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raise failure_error
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if g.user is not None:
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return token_info
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else:
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raise failure_error
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# If there's no token and we're in production, get the user from the SSO headers and return their token
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if not token and _is_production():
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uid = _get_request_uid()
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if uid is not None:
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db_user = UserModel.query.filter_by(uid=uid).first()
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if db_user is not None:
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g.user = db_user
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token = g.user.encode_auth_token().decode()
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token_info = UserModel.decode_auth_token(token)
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return token_info
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else:
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ApiError("no_user", "User not found. Please login via the frontend app before accessing this feature.", status_code=403)
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raise failure_error
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def verify_token_admin(token=None):
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"""
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Verifies the token for the user (if provided) in non-production environment. If in production environment,
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checks that the user is in the list of authorized admins
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Args:
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token: Optional[str]
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Returns:
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token: str
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"""
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print('=== verify_token_admin ===')
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print('_is_production()', _is_production())
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# If this is production, check that the user is in the list of admins
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if _is_production():
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uid = _get_request_uid()
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print('verify_token_admin uid', uid)
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if uid is not None and uid in app.config['ADMIN_UIDS']:
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return verify_token()
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# If we're not in production, just use the normal verify_token method
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else:
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return verify_token(token)
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def get_current_user():
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return UserModelSchema().dump(g.user)
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def login(
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uid=None,
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redirect_url=None,
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):
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"""
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In non-production environment, provides an endpoint for end-to-end system testing that allows the system
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to simulate logging in as a specific user. In production environment, simply logs user in via single-sign-on
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(SSO) Shibboleth authentication headers.
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Args:
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uid: Optional[str]
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redirect_url: Optional[str]
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Returns:
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str. If not on production, returns the frontend auth callback URL, with auth token appended.
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If on production and user is authenticated via SSO, returns the frontend auth callback URL,
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with auth token appended.
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Raises:
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ApiError. If on production and user is not authenticated, returns a 404 error.
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"""
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# ----------------------------------------
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# Shibboleth Authentication Headers
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# ----------------------------------------
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# X-Remote-Cn: Daniel Harold Funk (dhf8r)
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# X-Remote-Sn: Funk
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# X-Remote-Givenname: Daniel
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# X-Remote-Uid: dhf8r
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# Eppn: dhf8r@virginia.edu
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# Cn: Daniel Harold Funk (dhf8r)
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# Sn: Funk
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# Givenname: Daniel
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# Uid: dhf8r
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# X-Remote-User: dhf8r@virginia.edu
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# X-Forwarded-For: 128.143.0.10
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# X-Forwarded-Host: dev.crconnect.uvadcos.io
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# X-Forwarded-Server: dev.crconnect.uvadcos.io
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# Connection: Keep-Alive
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print('=== login ===')
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print('_is_production()', _is_production())
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# If we're in production, override any uid with the uid from the SSO request headers
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if _is_production():
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uid = _get_request_uid()
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if uid:
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app.logger.info("SSO_LOGIN: Full URL: " + request.url)
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app.logger.info("SSO_LOGIN: User Id: " + uid)
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app.logger.info("SSO_LOGIN: Will try to redirect to : " + str(redirect_url))
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ldap_info = LdapService().user_info(uid)
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if ldap_info:
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return _handle_login(ldap_info, redirect_url)
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raise ApiError('404', 'unknown')
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@app.route('/sso')
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def sso():
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response = ""
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response += "<h1>Headers</h1>"
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response += "<ul>"
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for k, v in request.headers:
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response += "<li><b>%s</b> %s</li>\n" % (k, v)
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response += "<h1>Environment</h1>"
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for k, v in request.environ:
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response += "<li><b>%s</b> %s</li>\n" % (k, v)
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return response
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def _handle_login(user_info: LdapUserInfo, redirect_url=None):
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"""
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On successful login, adds user to database if the user is not already in the system,
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then returns the frontend auth callback URL, with auth token appended.
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Args:
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user_info - an ldap user_info object.
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redirect_url: Optional[str]
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Returns:
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Response. 302 - Redirects to the frontend auth callback URL, with auth token appended.
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"""
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print('=== _handle_login ===')
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print('user_info', user_info)
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user = db.session.query(UserModel).filter(UserModel.uid == user_info.uid).first()
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if user is None:
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# Add new user
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user = UserModel()
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user.uid = user_info.uid
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user.display_name = user_info.display_name
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user.email_address = user_info.email_address
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user.affiliation = user_info.affiliation
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user.title = user_info.title
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db.session.add(user)
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db.session.commit()
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# Return the frontend auth callback URL, with auth token appended.
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auth_token = user.encode_auth_token().decode()
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if redirect_url is not None:
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if redirect_url.find("http://") != 0 and redirect_url.find("https://") != 0:
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redirect_url = "http://" + redirect_url
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url = '%s?token=%s' % (redirect_url, auth_token)
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app.logger.info("SSO_LOGIN: REDIRECTING TO: " + url)
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return flask.redirect(url, code=302)
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else:
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app.logger.info("SSO_LOGIN: NO REDIRECT, JUST RETURNING AUTH TOKEN.")
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return auth_token
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def _get_request_uid(uid=None):
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if _is_production():
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uid = request.headers.get("Uid")
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if not uid:
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uid = request.headers.get("X-Remote-Uid")
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if not uid:
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raise ApiError("invalid_sso_credentials", "'Uid' nor 'X-Remote-Uid' were present in the headers: %s"
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% str(request.headers))
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return uid
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def _is_production():
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return 'PRODUCTION' in app.config and app.config['PRODUCTION']
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