614 lines
19 KiB
C++
614 lines
19 KiB
C++
/* vim:set ts=4 sw=4 sts=4 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Negotiateauth
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*
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* The Initial Developer of the Original Code is Daniel Kouril.
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* Portions created by the Initial Developer are Copyright (C) 2003
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Daniel Kouril <kouril@ics.muni.cz> (original author)
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* Wyllys Ingersoll <wyllys.ingersoll@sun.com>
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* Christopher Nebergall <cneberg@sandia.gov>
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* Darin Fisher <darin@meer.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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//
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// GSSAPI Authentication Support Module
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//
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// Described by IETF Internet draft: draft-brezak-kerberos-http-00.txt
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// (formerly draft-brezak-spnego-http-04.txt)
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//
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// Also described here:
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// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsecure/html/http-sso-1.asp
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//
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// this #define must run before prlog.h is included
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#ifdef MOZ_LOGGING
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#define FORCE_PR_LOG 1
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#endif
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#include <string.h>
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#include <stdlib.h>
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#if defined(HAVE_GSSAPI_H)
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#include <gssapi.h>
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#elif defined(HAVE_GSSAPI_GSSAPI_H)
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#include <gssapi/gssapi.h>
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#endif
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#if defined(HAVE_GSSAPI_GENERIC_H)
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#include <gssapi_generic.h>
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#elif defined(HAVE_GSSAPI_GSSAPI_GENERIC_H)
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#include <gssapi/gssapi_generic.h>
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#endif
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#include "nsIHttpChannel.h"
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#include "nsISupportsUtils.h"
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#include "nsIServiceManager.h"
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#include "nsIPrefService.h"
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#include "nsIPrefBranch.h"
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#include "nsIURI.h"
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsNetCID.h"
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#include "plbase64.h"
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#include "plstr.h"
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#include "prprf.h"
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#include "prlog.h"
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#include "prmem.h"
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#include "nsHttpGssapiAuth.h"
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//-----------------------------------------------------------------------------
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#ifdef PR_LOGGING
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//
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// in order to do logging, the following environment variables need to be set:
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//
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// set NSPR_LOG_MODULES=negotiateauth:4
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// set NSPR_LOG_FILE=negotiateauth.log
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//
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static PRLogModuleInfo* gNegotiateLog;
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#define LOG(args) PR_LOG(gNegotiateLog, PR_LOG_DEBUG, args)
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// Generate proper GSSAPI error messages from the major and
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// minor status codes.
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void
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LogGssError(OM_uint32 maj_stat, OM_uint32 min_stat, const char *prefix)
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{
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OM_uint32 new_stat;
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OM_uint32 msg_ctx = 0;
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gss_buffer_desc status1_string;
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gss_buffer_desc status2_string;
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OM_uint32 ret;
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nsCAutoString error(prefix);
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error += ": ";
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do {
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ret = gss_display_status (&new_stat,
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maj_stat,
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GSS_C_GSS_CODE,
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GSS_C_NULL_OID,
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&msg_ctx,
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&status1_string);
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error += (const char *) status1_string.value;
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error += '\n';
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ret = gss_display_status (&new_stat,
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min_stat,
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GSS_C_MECH_CODE,
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GSS_C_NULL_OID,
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&msg_ctx,
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&status2_string);
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error += (const char *) status2_string.value;
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error += '\n';
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} while (!GSS_ERROR(ret) && msg_ctx != 0);
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LOG(("%s\n", error.get()));
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}
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#else /* PR_LOGGING */
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#define LOG(args)
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#define LogGssError(x,y,z)
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#endif /* PR_LOGGING */
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//-----------------------------------------------------------------------------
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static const char kNegotiate[] = "Negotiate";
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static const char kNegotiateAuthTrustedURIs[] = "network.negotiate-auth.trusted-uris";
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static const char kNegotiateAuthDelegationURIs[] = "network.negotiate-auth.delegation-uris";
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#define kNegotiateLen (sizeof(kNegotiate)-1)
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class nsGssapiContinuationState : public nsISupports
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{
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public:
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NS_DECL_ISUPPORTS
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nsGssapiContinuationState();
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~nsGssapiContinuationState() { Reset(); }
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void Reset();
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gss_OID GetOID() { return mech_oid; }
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gss_ctx_id_t mCtx;
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private:
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gss_OID mech_oid;
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};
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nsGssapiContinuationState::nsGssapiContinuationState()
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{
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OM_uint32 minstat, majstat;
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gss_OID_set mech_set;
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gss_OID item;
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unsigned int i;
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static gss_OID_desc gss_krb5_mech_oid_desc =
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{9, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"};
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static gss_OID_desc gss_spnego_mech_oid_desc =
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{6, (void *) "\x2b\x06\x01\x05\x05\x02"};
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mCtx = GSS_C_NO_CONTEXT;
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mech_oid = &gss_krb5_mech_oid_desc;
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int mech_found = 0;
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//
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// Now, look at the list of supported mechanisms,
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// if SPNEGO is found, then use it.
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// Otherwise, set the desired mechanism to
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// GSS_C_NO_OID and let the system try to use
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// the default mechanism.
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//
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// Using Kerberos directly (instead of negotiating
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// with SPNEGO) may work in some cases depending
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// on how smart the server side is.
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//
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majstat = gss_indicate_mechs(&minstat, &mech_set);
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if (GSS_ERROR(majstat))
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return;
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for (i=0; i<mech_set->count && !mech_found; i++) {
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item = &mech_set->elements[i];
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if (item->length == gss_spnego_mech_oid_desc.length &&
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!memcmp(item->elements, gss_spnego_mech_oid_desc.elements,
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item->length)) {
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mech_found = 1;
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mech_oid = &gss_spnego_mech_oid_desc;
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break;
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}
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}
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gss_release_oid_set(&minstat, &mech_set);
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}
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void
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nsGssapiContinuationState::Reset()
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{
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if (mCtx != GSS_C_NO_CONTEXT) {
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OM_uint32 minor_status;
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gss_delete_sec_context(&minor_status, &mCtx, GSS_C_NO_BUFFER);
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}
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mCtx = GSS_C_NO_CONTEXT;
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}
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NS_IMPL_ISUPPORTS0(nsGssapiContinuationState)
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//-----------------------------------------------------------------------------
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nsHttpGssapiAuth::nsHttpGssapiAuth()
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{
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#ifdef PR_LOGGING
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if (!gNegotiateLog)
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gNegotiateLog = PR_NewLogModule("negotiateauth");
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#endif
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}
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NS_IMETHODIMP
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nsHttpGssapiAuth::GetAuthFlags(PRUint32 *flags)
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{
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//
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// GSSAPI creds should not be reused across multiple requests.
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// Only perform the negotiation when it is explicitly requested
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// by the server. Thus, do *NOT* use the "REUSABLE_CREDENTIALS"
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// flag here.
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//
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// CONNECTION_BASED is specified instead of REQUEST_BASED since
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// we need to complete a sequence of transactions with the server
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// over the same connection.
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//
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*flags = CONNECTION_BASED | IDENTITY_IGNORED;
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return NS_OK;
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}
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//
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// Always set *identityInvalid == FALSE here. This
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// will prevent the browser from popping up the authentication
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// prompt window. Because GSSAPI does not have an API
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// for fetching initial credentials (ex: A Kerberos TGT),
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// there is no correct way to get the users credentials.
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//
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NS_IMETHODIMP
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nsHttpGssapiAuth::ChallengeReceived(nsIHttpChannel *httpChannel,
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const char *challenge,
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PRBool isProxyAuth,
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nsISupports **sessionState,
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nsISupports **continuationState,
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PRBool *identityInvalid)
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{
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nsGssapiContinuationState *state = (nsGssapiContinuationState *) *continuationState;
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*identityInvalid = PR_FALSE;
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// proxy auth not supported
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if (isProxyAuth)
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return NS_ERROR_ABORT;
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PRBool allowed = TestPref(httpChannel, kNegotiateAuthTrustedURIs);
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if (!allowed) {
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LOG(("nsHttpNegotiateAuth::ChallengeReceived URI blocked\n"));
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return NS_ERROR_ABORT;
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}
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//
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// Use this opportunity to instantiate the state object
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// that gets used later when we generate the credentials.
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//
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if (!state) {
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state = new nsGssapiContinuationState();
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if (!state)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*continuationState = state);
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}
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return NS_OK;
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}
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NS_IMPL_ISUPPORTS1(nsHttpGssapiAuth, nsIHttpAuthenticator)
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//
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// GenerateCredentials
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//
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// This routine is responsible for creating the correct authentication
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// blob to pass to the server that requested "Negotiate" authentication.
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//
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NS_IMETHODIMP
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nsHttpGssapiAuth::GenerateCredentials(nsIHttpChannel *httpChannel,
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const char *challenge,
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PRBool isProxyAuth,
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const PRUnichar *domain,
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const PRUnichar *username,
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const PRUnichar *password,
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nsISupports **sessionState,
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nsISupports **continuationState,
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char **creds)
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{
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OM_uint32 major_status, minor_status;
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OM_uint32 req_flags = 0;
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gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_t in_token_ptr = GSS_C_NO_BUFFER;
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gss_name_t server;
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nsGssapiContinuationState *state = (nsGssapiContinuationState *) *continuationState;
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nsCOMPtr<nsIURI> uri;
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nsresult rv;
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nsCString service;
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LOG(("nsHttpGssapiAuth::GenerateCredentials() [challenge=%s]\n", challenge));
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NS_ASSERTION(creds, "null param");
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PRBool isGssapiAuth =
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!PL_strncasecmp(challenge, kNegotiate, kNegotiateLen);
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NS_ENSURE_TRUE(isGssapiAuth, NS_ERROR_UNEXPECTED);
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// proxy auth not supported
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if (isProxyAuth)
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return NS_ERROR_ABORT;
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PRBool delegation = TestPref(httpChannel, kNegotiateAuthDelegationURIs);
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if (delegation) {
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LOG((" using GSS_C_DELEG_FLAG\n"));
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req_flags |= GSS_C_DELEG_FLAG;
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}
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rv = httpChannel->GetURI(getter_AddRefs(uri));
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if (NS_FAILED(rv)) return rv;
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rv = uri->GetAsciiHost(service);
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if (NS_FAILED(rv)) return rv;
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LOG((" hostname = %s\n", service.get()));
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//
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// The correct service name for IIS servers is "HTTP/f.q.d.n", so
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// construct the proper service name for passing to "gss_import_name".
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//
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// TODO: Possibly make this a configurable service name for use
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// with non-standard servers that use stuff like "khttp/f.q.d.n"
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// instead.
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//
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service.Insert("HTTP@", 0);
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input_token.value = (void *)service.get();
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input_token.length = service.Length() + 1;
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major_status = gss_import_name(&minor_status,
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&input_token,
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#ifdef HAVE_GSS_C_NT_HOSTBASED_SERVICE
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GSS_C_NT_HOSTBASED_SERVICE,
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#else
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gss_nt_service_name,
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#endif
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&server);
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input_token.value = NULL;
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input_token.length = 0;
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if (GSS_ERROR(major_status)) {
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LogGssError(major_status, minor_status, "gss_import_name() failed");
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return NS_ERROR_FAILURE;
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}
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//
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// If the "Negotiate:" header had some data associated with it,
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// that data should be used as the input to this call. This may
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// be a continuation of an earlier call because GSSAPI authentication
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// often takes multiple round-trips to complete depending on the
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// context flags given. We want to use MUTUAL_AUTHENTICATION which
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// generally *does* require multiple round-trips. Don't assume
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// auth can be completed in just 1 call.
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//
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unsigned int len = strlen(challenge);
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if (len > kNegotiateLen) {
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challenge += kNegotiateLen;
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while (*challenge == ' ') challenge++;
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len = strlen(challenge);
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input_token.length = (len * 3)/4;
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input_token.value = malloc(input_token.length);
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if (!input_token.value)
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return (NS_ERROR_OUT_OF_MEMORY);
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//
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// Decode the response that followed the "Negotiate" token
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//
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if (PL_Base64Decode(challenge, len, (char *) input_token.value) == NULL) {
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free(input_token.value);
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return(NS_ERROR_UNEXPECTED);
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}
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in_token_ptr = &input_token;
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}
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else {
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//
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// Starting over, clear out any existing context and don't
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// use an input token.
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//
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state->Reset();
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in_token_ptr = GSS_C_NO_BUFFER;
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}
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major_status = gss_init_sec_context(&minor_status,
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GSS_C_NO_CREDENTIAL,
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&state->mCtx,
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server,
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state->GetOID(),
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req_flags,
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GSS_C_INDEFINITE,
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GSS_C_NO_CHANNEL_BINDINGS,
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in_token_ptr,
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nsnull,
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&output_token,
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nsnull,
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nsnull);
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if (GSS_ERROR(major_status)) {
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LogGssError(major_status, minor_status, "gss_init_sec_context() failed");
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gss_release_name(&minor_status, &server);
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state->Reset();
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if (input_token.length > 0 && input_token.value != NULL)
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gss_release_buffer(&minor_status, &input_token);
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return NS_ERROR_FAILURE;
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}
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if (major_status == GSS_S_COMPLETE) {
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//
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// We are done with this authentication, reset the context.
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//
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state->Reset();
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}
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else if (major_status == GSS_S_CONTINUE_NEEDED) {
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//
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// The important thing is that we do NOT reset the
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// context here because it will be needed on the
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// next call.
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//
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}
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// We don't need the input token data anymore.
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if (input_token.length > 0 && input_token.value != NULL)
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gss_release_buffer(&minor_status, &input_token);
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if (output_token.length == 0) {
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LOG((" No GSS output token to send, exiting"));
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gss_release_name(&minor_status, &server);
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return NS_ERROR_FAILURE;
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}
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//
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// The token output from the gss_init_sec_context call is
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// encoded and used as the Authentication response for the
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// server.
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//
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char *encoded_token = PL_Base64Encode((char *)output_token.value,
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output_token.length,
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nsnull);
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if (!encoded_token) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto end;
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}
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LOG((" Sending a token of length %d\n", output_token.length));
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// allocate a buffer sizeof("Negotiate" + " " + b64output_token + "\0")
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*creds = (char *) nsMemory::Alloc (kNegotiateLen + 1 + strlen(encoded_token) + 1);
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if (!(*creds)) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto end;
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}
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sprintf(*creds, "%s %s", kNegotiate, encoded_token);
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rv = NS_OK;
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end:
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if (encoded_token)
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PR_Free(encoded_token);
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gss_release_buffer(&minor_status, &output_token);
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gss_release_name(&minor_status, &server);
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LOG((" returning the call"));
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return rv;
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}
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PRBool
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nsHttpGssapiAuth::TestPref(nsIHttpChannel *httpChannel, const char *pref)
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{
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nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
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if (!prefs)
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return PR_FALSE;
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nsCOMPtr<nsIURI> uri;
|
|
httpChannel->GetURI(getter_AddRefs(uri));
|
|
if (!uri)
|
|
return PR_FALSE;
|
|
|
|
nsCAutoString scheme, host;
|
|
PRInt32 port;
|
|
|
|
if (NS_FAILED(uri->GetScheme(scheme)))
|
|
return PR_FALSE;
|
|
if (NS_FAILED(uri->GetAsciiHost(host)))
|
|
return PR_FALSE;
|
|
if (NS_FAILED(uri->GetPort(&port)))
|
|
return PR_FALSE;
|
|
|
|
char *hostList;
|
|
if (NS_FAILED(prefs->GetCharPref(pref, &hostList)) || !hostList)
|
|
return PR_FALSE;
|
|
|
|
// pseudo-BNF
|
|
// ----------
|
|
//
|
|
// url-list base-url ( base-url "," LWS )*
|
|
// base-url ( scheme-part | host-part | scheme-part host-part )
|
|
// scheme-part scheme "://"
|
|
// host-part host [":" port]
|
|
//
|
|
// for example:
|
|
// "https://, http://office.foo.com"
|
|
//
|
|
|
|
char *start = hostList, *end;
|
|
for (;;) {
|
|
// skip past any whitespace
|
|
while (*start == ' ' || *start == '\t')
|
|
++start;
|
|
end = strchr(start, ',');
|
|
if (!end)
|
|
end = start + strlen(start);
|
|
if (start == end)
|
|
break;
|
|
if (MatchesBaseURI(scheme, host, port, start, end))
|
|
return PR_TRUE;
|
|
if (*end == '\0')
|
|
break;
|
|
start = end + 1;
|
|
}
|
|
|
|
nsMemory::Free(hostList);
|
|
return PR_FALSE;
|
|
}
|
|
|
|
PRBool
|
|
nsHttpGssapiAuth::MatchesBaseURI(const nsCSubstring &matchScheme,
|
|
const nsCSubstring &matchHost,
|
|
PRInt32 matchPort,
|
|
const char *baseStart,
|
|
const char *baseEnd)
|
|
{
|
|
// check if scheme://host:port matches baseURI
|
|
|
|
// parse the base URI
|
|
const char *hostStart, *schemeEnd = strstr(baseStart, "://");
|
|
if (schemeEnd) {
|
|
// the given scheme must match the parsed scheme exactly
|
|
if (!matchScheme.Equals(Substring(baseStart, schemeEnd)))
|
|
return PR_FALSE;
|
|
hostStart = schemeEnd + 3;
|
|
}
|
|
else
|
|
hostStart = baseStart;
|
|
|
|
// XXX this does not work for IPv6-literals
|
|
const char *hostEnd = strchr(hostStart, ':');
|
|
if (hostEnd) {
|
|
// the given port must match the parsed port exactly
|
|
int port = atoi(hostEnd + 1);
|
|
if (matchPort != (PRInt32) port)
|
|
return PR_FALSE;
|
|
}
|
|
else
|
|
hostEnd = baseEnd;
|
|
|
|
|
|
// if we didn't parse out a host, then assume we got a match.
|
|
if (hostStart == hostEnd)
|
|
return PR_TRUE;
|
|
|
|
PRUint32 hostLen = hostEnd - hostStart;
|
|
|
|
// now, allow host to be a subdomain of matchHost
|
|
if (matchHost.Length() > hostLen)
|
|
return PR_FALSE;
|
|
|
|
const char *end = matchHost.EndReading();
|
|
if (PL_strncasecmp(end - hostLen, hostStart, hostLen) == 0) {
|
|
// if matchHost ends with host from the base URI, then make sure it is
|
|
// either an exact match, or prefixed with a dot. we don't want
|
|
// "foobar.com" to match "bar.com"
|
|
if (matchHost.Length() == hostLen ||
|
|
*(end - hostLen) == '.' ||
|
|
*(end - hostLen - 1) == '.')
|
|
return PR_TRUE;
|
|
}
|
|
|
|
return PR_FALSE;
|
|
}
|