src/auth/Acl.cc

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #include "squid.h"
  10 #include "acl/Acl.h"
  11 #include "acl/FilledChecklist.h"
  12 #include "auth/Acl.h"
  13 #include "auth/AclProxyAuth.h"
  14 #include "auth/UserRequest.h"
  15 #include "client_side.h"
  16 #include "fatal.h"
  17 #include "HttpRequest.h"
  18
  19 /**
  20  * \retval ACCESS_AUTH_REQUIRED credentials missing. challenge required.
  21  * \retval ACCESS_DENIED        user not authenticated (authentication error?)
  22  * \retval ACCESS_DUNNO         user authentication is in progress
  23  * \retval ACCESS_DENIED        user not authorized
  24  * \retval ACCESS_ALLOWED       user authenticated and authorized
  25  */
  26 allow_t
  27 AuthenticateAcl(ACLChecklist *ch)
  28 {
  29     ACLFilledChecklist *checklist = Filled(ch);
  30     HttpRequest *request = checklist->request;
  31     http_hdr_type headertype;
  32
  33     if (NULL == request) {
  34         fatal ("requiresRequest SHOULD have been true for this ACL!!");
  35         return ACCESS_DENIED;
  36     } else if (request->flags.sslBumped) {
  37         debugs(28, 5, "SslBumped request: It is an encapsulated request do not authenticate");
  38         checklist->auth_user_request = checklist->conn() != NULL ? checklist->conn()->getAuth() : request->auth_user_request;
  39         if (checklist->auth_user_request != NULL)
  40             return ACCESS_ALLOWED;
  41         else
  42             return ACCESS_DENIED;
  43     } else if (request->flags.accelerated) {
  44         /* WWW authorization on accelerated requests */
  45         headertype = HDR_AUTHORIZATION;
  46     } else if (request->flags.intercepted || request->flags.interceptTproxy) {
  47         debugs(28, DBG_IMPORTANT, "NOTICE: Authentication not applicable on intercepted requests.");
  48         return ACCESS_DENIED;
  49     } else {
  50         /* Proxy authorization on proxy requests */
  51         headertype = HDR_PROXY_AUTHORIZATION;
  52     }
  53
  54     /* get authed here */
  55     /* Note: this fills in auth_user_request when applicable */
  56     const AuthAclState result = Auth::UserRequest::tryToAuthenticateAndSetAuthUser(
  57                                     &checklist->auth_user_request, headertype, request,
  58                                     checklist->conn(), checklist->src_addr, checklist->al);
  59     switch (result) {
  60
  61     case AUTH_ACL_CANNOT_AUTHENTICATE:
  62         debugs(28, 4, HERE << "returning " << ACCESS_DENIED << " user authenticated but not authorised.");
  63         return ACCESS_DENIED;
  64
  65     case AUTH_AUTHENTICATED:
  66         return ACCESS_ALLOWED;
  67         break;
  68
  69     case AUTH_ACL_HELPER:
  70         if (checklist->goAsync(ProxyAuthLookup::Instance()))
  71             debugs(28, 4, "returning " << ACCESS_DUNNO << " sending credentials to helper.");
  72         else
  73             debugs(28, 2, "cannot go async; returning " << ACCESS_DUNNO);
  74         return ACCESS_DUNNO; // XXX: break this down into DUNNO, EXPIRED_OK, EXPIRED_BAD states
  75
  76     case AUTH_ACL_CHALLENGE:
  77         debugs(28, 4, HERE << "returning " << ACCESS_AUTH_REQUIRED << " sending authentication challenge.");
  78         /* Client is required to resend the request with correct authentication
  79          * credentials. (This may be part of a stateful auth protocol.)
  80          * The request is denied.
  81          */
  82         return ACCESS_AUTH_REQUIRED;
  83
  84     default:
  85         fatal("unexpected authenticateAuthenticate reply\n");
  86         return ACCESS_DENIED;
  87     }
  88 }
  89