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    1/*  Part of SWISH
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@cs.vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (C): 2017, VU University Amsterdam
    7			 CWI Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   28    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   29    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   30    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   32    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(swish_authenticate,
   37          [ authenticate/2,                     % +Request, -Authentity
   38            user_property/2                     % +Authentity, ?Property
   39          ]).   40:- use_module(library(http/http_wrapper)).   41:- use_module(library(debug)).   42:- use_module(library(broadcast)).   43
   44:- use_module(config).   45
   46/** <module> Authentication access for SWISH
   47
   48This module (depending on the loaded  configuration) identifies the user
   49based on the HTTP request.
   50
   51@see pep.pl for _authorization_ issues.
   52*/
   53
   54%!  authenticate(+Request, -Identity:dict) is det.
   55%
   56%   Establish the identity behind  the  HTTP   Request.  There  are  two
   57%   scenarios.
   58%
   59%     - The entire server is protected using HTTP authentication.  In
   60%       this case this predicate may throw an HTTP challenge or a
   61%       forbidden exception.
   62%     - The server allows for mixed anonymous and logged in usage. Login
   63%       may use HTTP or federated login (oauth2).
   64%
   65%   @throws http_reply(_) HTTP authentication and permission exceptions
   66%   if config-available/auth_http_always.pl is enabled.
   67
   68authenticate(Request, Auth) :-
   69    http_peer(Request, Peer),
   70    http_auth(Request, HTTPAuth),
   71    profile_auth(Request, ProfileAuth),
   72    Auth2 = HTTPAuth.put(ProfileAuth).put(peer, Peer),
   73    identity(Request, Auth2, Auth),
   74    debug(authenticate, 'Identity: ~p', [Auth]).
   75
   76:- multifile
   77    swish_config:user_info/3,
   78    swish_config:authenticate/2,
   79    swish_config:user_profile/2.   80
   81http_auth(Request, Auth) :-
   82    (   swish_config:authenticate(Request, User)   % throws http_reply(_)
   83    ->  true
   84    ;   swish_config:user_info(Request, local, UserInfo),
   85        User = UserInfo.get(user)
   86    ),
   87    !,
   88    Auth = auth{user:User, identity_provider:local, external_identity:User}.
   89http_auth(_Request, auth{}).
   90
   91profile_auth(Request, Auth) :-
   92    swish_config:user_profile(Request, Profile),
   93    Pattern = _{ identity_provider: _,
   94                 external_identity: _,
   95                 profile_id:_},
   96    Pattern :< Profile,
   97    Auth = auth{}.put(Pattern).
   98profile_auth(_, auth{}).
   99
  100identity(Request, Auth0, Auth) :-
  101    _{identity_provider:Provider, external_identity:ExtID} :< Auth0,
  102    !,
  103    (   swish_config:user_info(Request, Provider, UserInfo),
  104        is_dict(UserInfo, Tag),
  105        (   var(Tag)
  106        ->  Tag = user_info
  107        ;   true
  108        )
  109    ->  true
  110    ;   UserInfo = user_info{}
  111    ),
  112    atomic_list_concat([Provider,ExtID], :, Identity),
  113    Auth = Auth0.put(_{identity:Identity, user_info:UserInfo}).
  114identity(_, Auth, Auth).
  115
  116
  117%!  user_property(+Identity, ?Property) is nondet.
  118%
  119%   True when Identity has Property. Defined properties are:
  120%
  121%     - peer(Atom)
  122%     Remote IP address
  123%     - identity(Atom)
  124%     Identity as provided by some identity provider
  125%     - identity_provider(Atom)
  126%     Subsystem that identified the user
  127%     - external_identity(Atom)
  128%     Identity as provided by the identity_provider
  129%     - profile_id(Atom)
  130%     Identifier of the profile we have on this user.
  131%     - login(Atom)
  132%     Same as identity_provider(Atom)
  133%     - name(Atom)
  134%     Name associated with the identity
  135%     - email(Atom)
  136%     Email associated with the identity
  137
  138user_property(Identity, Property) :-
  139    current_user_property(Property, How),
  140    user_property_impl(Property, How, Identity).
  141
  142user_property_impl(Property, dict, Identity) :- !,
  143    Property =.. [Name,Value],
  144    Value = Identity.get(Name).
  145user_property_impl(Property, broadcast, Identity) :-
  146    broadcast_request(identity_property(Identity, Property)).
  147user_property_impl(login(By), _, Identity) :-
  148    By = Identity.get(identity_provider).
  149
  150
  151current_user_property(peer(_Atom),                dict).
  152current_user_property(identity(_Atom),            dict).
  153current_user_property(external_identity(_String), dict).
  154current_user_property(identity_provider(_Atom),   dict).
  155current_user_property(profile_id(_Atom),          dict).
  156current_user_property(avatar(_String),            dict).
  157
  158current_user_property(login(_IdProvider),         derived).
  159current_user_property(name(_Name),                broadcast).
  160current_user_property(email(_Email),              broadcast).
  161
  162
  163		 /*******************************
  164		 *        PENGINE HOOKS		*
  165		 *******************************/
  166
  167%!  pengines:authentication_hook(+Request, +Application, -User)
  168%
  169%   Is called from the /pengine/create request   to establish the logged
  170%   in user.
  171
  172:- multifile pengines:authentication_hook/3.  173
  174pengines:authentication_hook(Request, _Application, User) :-
  175    authenticate(Request, User)