LCOV - code coverage report
Current view: top level - third_party/heimdal/lib/gssapi/spnego - context_stubs.c (source / functions) Hit Total Coverage
Test: coverage report for master 2b515b7d Lines: 5 186 2.7 %
Date: 2024-02-28 12:06:22 Functions: 1 18 5.6 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2004, PADL Software Pty Ltd.
       3             :  * All rights reserved.
       4             :  *
       5             :  * Redistribution and use in source and binary forms, with or without
       6             :  * modification, are permitted provided that the following conditions
       7             :  * are met:
       8             :  *
       9             :  * 1. Redistributions of source code must retain the above copyright
      10             :  *    notice, this list of conditions and the following disclaimer.
      11             :  *
      12             :  * 2. Redistributions in binary form must reproduce the above copyright
      13             :  *    notice, this list of conditions and the following disclaimer in the
      14             :  *    documentation and/or other materials provided with the distribution.
      15             :  *
      16             :  * 3. Neither the name of PADL Software nor the names of its contributors
      17             :  *    may be used to endorse or promote products derived from this software
      18             :  *    without specific prior written permission.
      19             :  *
      20             :  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
      21             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      22             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      23             :  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
      24             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      25             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      26             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      27             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      28             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      29             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      30             :  * SUCH DAMAGE.
      31             :  */
      32             : 
      33             : #include "spnego_locl.h"
      34             : 
      35           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_process_context_token
      36             :            (OM_uint32 *minor_status,
      37             :             gss_const_ctx_id_t context_handle,
      38             :             const gss_buffer_t token_buffer
      39             :            )
      40             : {
      41           0 :     gss_ctx_id_t context;
      42           0 :     gssspnego_ctx ctx;
      43           0 :     OM_uint32 ret;
      44             : 
      45           0 :     if (context_handle == GSS_C_NO_CONTEXT)
      46           0 :         return GSS_S_NO_CONTEXT;
      47             : 
      48           0 :     context = (gss_ctx_id_t)context_handle;
      49           0 :     ctx = (gssspnego_ctx)context_handle;
      50             : 
      51           0 :     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
      52             : 
      53           0 :     ret = gss_process_context_token(minor_status,
      54           0 :                                     ctx->negotiated_ctx_id,
      55             :                                     token_buffer);
      56           0 :     if (ret != GSS_S_COMPLETE) {
      57             :         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
      58           0 :         return ret;
      59             :     }
      60             : 
      61           0 :     ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
      62             : 
      63           0 :     return _gss_spnego_internal_delete_sec_context(minor_status,
      64             :                                            &context,
      65             :                                            GSS_C_NO_BUFFER);
      66             : }
      67             : 
      68           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_delete_sec_context
      69             :            (OM_uint32 *minor_status,
      70             :             gss_ctx_id_t *context_handle,
      71             :             gss_buffer_t output_token
      72             :            )
      73             : {
      74           0 :     gssspnego_ctx ctx;
      75             : 
      76           0 :     if (context_handle == NULL || *context_handle == GSS_C_NO_CONTEXT)
      77           0 :         return GSS_S_NO_CONTEXT;
      78             : 
      79           0 :     ctx = (gssspnego_ctx)*context_handle;
      80             : 
      81           0 :     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
      82             : 
      83           0 :     return _gss_spnego_internal_delete_sec_context(minor_status,
      84             :                                                    context_handle,
      85             :                                                    output_token);
      86             : }
      87             : 
      88           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_context_time
      89             :            (OM_uint32 *minor_status,
      90             :             gss_const_ctx_id_t context_handle,
      91             :             OM_uint32 *time_rec
      92             :            )
      93             : {
      94           0 :     gssspnego_ctx ctx;
      95           0 :     *minor_status = 0;
      96             : 
      97           0 :     if (context_handle == GSS_C_NO_CONTEXT) {
      98           0 :         return GSS_S_NO_CONTEXT;
      99             :     }
     100             : 
     101           0 :     ctx = (gssspnego_ctx)context_handle;
     102             : 
     103           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     104           0 :         return GSS_S_NO_CONTEXT;
     105             :     }
     106             : 
     107           0 :     return gss_context_time(minor_status,
     108           0 :                             ctx->negotiated_ctx_id,
     109             :                             time_rec);
     110             : }
     111             : 
     112           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_get_mic
     113             :            (OM_uint32 *minor_status,
     114             :             gss_const_ctx_id_t context_handle,
     115             :             gss_qop_t qop_req,
     116             :             const gss_buffer_t message_buffer,
     117             :             gss_buffer_t message_token
     118             :            )
     119             : {
     120           0 :     gssspnego_ctx ctx;
     121             : 
     122           0 :     *minor_status = 0;
     123             : 
     124           0 :     if (context_handle == GSS_C_NO_CONTEXT) {
     125           0 :         return GSS_S_NO_CONTEXT;
     126             :     }
     127             : 
     128           0 :     ctx = (gssspnego_ctx)context_handle;
     129             : 
     130           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     131           0 :         return GSS_S_NO_CONTEXT;
     132             :     }
     133             : 
     134           0 :     return gss_get_mic(minor_status, ctx->negotiated_ctx_id,
     135             :                        qop_req, message_buffer, message_token);
     136             : }
     137             : 
     138           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_verify_mic
     139             :            (OM_uint32 * minor_status,
     140             :             gss_const_ctx_id_t context_handle,
     141             :             const gss_buffer_t message_buffer,
     142             :             const gss_buffer_t token_buffer,
     143             :             gss_qop_t * qop_state
     144             :            )
     145             : {
     146           0 :     gssspnego_ctx ctx;
     147             : 
     148           0 :     *minor_status = 0;
     149             : 
     150           0 :     if (context_handle == GSS_C_NO_CONTEXT) {
     151           0 :         return GSS_S_NO_CONTEXT;
     152             :     }
     153             : 
     154           0 :     ctx = (gssspnego_ctx)context_handle;
     155             : 
     156           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     157           0 :         return GSS_S_NO_CONTEXT;
     158             :     }
     159             : 
     160           0 :     return gss_verify_mic(minor_status,
     161           0 :                           ctx->negotiated_ctx_id,
     162             :                           message_buffer,
     163             :                           token_buffer,
     164             :                           qop_state);
     165             : }
     166             : 
     167           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_wrap
     168             :            (OM_uint32 * minor_status,
     169             :             gss_const_ctx_id_t context_handle,
     170             :             int conf_req_flag,
     171             :             gss_qop_t qop_req,
     172             :             const gss_buffer_t input_message_buffer,
     173             :             int * conf_state,
     174             :             gss_buffer_t output_message_buffer
     175             :            )
     176             : {
     177           0 :     gssspnego_ctx ctx;
     178             : 
     179           0 :     *minor_status = 0;
     180             : 
     181           0 :     if (context_handle == GSS_C_NO_CONTEXT) {
     182           0 :         return GSS_S_NO_CONTEXT;
     183             :     }
     184             : 
     185           0 :     ctx = (gssspnego_ctx)context_handle;
     186             : 
     187           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     188           0 :         return GSS_S_NO_CONTEXT;
     189             :     }
     190             : 
     191           0 :     return gss_wrap(minor_status,
     192           0 :                     ctx->negotiated_ctx_id,
     193             :                     conf_req_flag,
     194             :                     qop_req,
     195             :                     input_message_buffer,
     196             :                     conf_state,
     197             :                     output_message_buffer);
     198             : }
     199             : 
     200           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_unwrap
     201             :            (OM_uint32 * minor_status,
     202             :             gss_const_ctx_id_t context_handle,
     203             :             const gss_buffer_t input_message_buffer,
     204             :             gss_buffer_t output_message_buffer,
     205             :             int * conf_state,
     206             :             gss_qop_t * qop_state
     207             :            )
     208             : {
     209           0 :     gssspnego_ctx ctx;
     210             : 
     211           0 :     *minor_status = 0;
     212             : 
     213           0 :     if (context_handle == GSS_C_NO_CONTEXT) {
     214           0 :         return GSS_S_NO_CONTEXT;
     215             :     }
     216             : 
     217           0 :     ctx = (gssspnego_ctx)context_handle;
     218             : 
     219           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     220           0 :         return GSS_S_NO_CONTEXT;
     221             :     }
     222             : 
     223           0 :     return gss_unwrap(minor_status,
     224           0 :                       ctx->negotiated_ctx_id,
     225             :                       input_message_buffer,
     226             :                       output_message_buffer,
     227             :                       conf_state,
     228             :                       qop_state);
     229             : }
     230             : 
     231           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_inquire_context (
     232             :             OM_uint32 * minor_status,
     233             :             gss_const_ctx_id_t context_handle,
     234             :             gss_name_t * src_name,
     235             :             gss_name_t * targ_name,
     236             :             OM_uint32 * lifetime_rec,
     237             :             gss_OID * mech_type,
     238             :             OM_uint32 * ctx_flags,
     239             :             int * locally_initiated,
     240             :             int * open_context
     241             :            )
     242             : {
     243           0 :     gssspnego_ctx ctx;
     244           0 :     OM_uint32 maj_stat;
     245             : 
     246           0 :     *minor_status = 0;
     247             : 
     248           0 :     if (context_handle == GSS_C_NO_CONTEXT)
     249           0 :         return GSS_S_NO_CONTEXT;
     250             : 
     251           0 :     ctx = (gssspnego_ctx)context_handle;
     252             : 
     253           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT)
     254           0 :         return GSS_S_NO_CONTEXT;
     255             : 
     256           0 :     maj_stat = gss_inquire_context(minor_status,
     257           0 :                                    ctx->negotiated_ctx_id,
     258             :                                    src_name,
     259             :                                    targ_name,
     260             :                                    lifetime_rec,
     261             :                                    mech_type,
     262             :                                    ctx_flags,
     263             :                                    locally_initiated,
     264             :                                    open_context);
     265             : 
     266           0 :     if (open_context)
     267           0 :         *open_context = gssspnego_ctx_complete_p(ctx);
     268             : 
     269           0 :     return maj_stat;
     270             : }
     271             : 
     272           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_wrap_size_limit (
     273             :             OM_uint32 * minor_status,
     274             :             gss_const_ctx_id_t context_handle,
     275             :             int conf_req_flag,
     276             :             gss_qop_t qop_req,
     277             :             OM_uint32 req_output_size,
     278             :             OM_uint32 * max_input_size
     279             :            )
     280             : {
     281           0 :     gssspnego_ctx ctx;
     282             : 
     283           0 :     *minor_status = 0;
     284             : 
     285           0 :     if (context_handle == GSS_C_NO_CONTEXT) {
     286           0 :         return GSS_S_NO_CONTEXT;
     287             :     }
     288             : 
     289           0 :     ctx = (gssspnego_ctx)context_handle;
     290             : 
     291           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     292           0 :         return GSS_S_NO_CONTEXT;
     293             :     }
     294             : 
     295           0 :     return gss_wrap_size_limit(minor_status,
     296           0 :                                ctx->negotiated_ctx_id,
     297             :                                conf_req_flag,
     298             :                                qop_req,
     299             :                                req_output_size,
     300             :                                max_input_size);
     301             : }
     302             : 
     303           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_export_sec_context (
     304             :             OM_uint32 * minor_status,
     305             :             gss_ctx_id_t * context_handle,
     306             :             gss_buffer_t interprocess_token
     307             :            )
     308             : {
     309           0 :     gssspnego_ctx ctx;
     310           0 :     OM_uint32 major_status;
     311             : 
     312           0 :     *minor_status = 0;
     313             : 
     314           0 :     if (context_handle == NULL)
     315           0 :         return GSS_S_NO_CONTEXT;
     316             : 
     317           0 :     ctx = (gssspnego_ctx)*context_handle;
     318             : 
     319           0 :     if (ctx == NULL)
     320           0 :         return GSS_S_NO_CONTEXT;
     321             : 
     322           0 :     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
     323             : 
     324             :     /*
     325             :      * Partial context export is only supported on the acceptor side, as we
     326             :      * cannot represent the initiator function pointer state in an exported
     327             :      * token, and also because it is mostly useful for acceptors which need
     328             :      * to manage multiple initiator states.
     329             :      */
     330           0 :     if (ctx->flags.local && !gssspnego_ctx_complete_p(ctx)) {
     331           0 :         major_status = GSS_S_NO_CONTEXT;
     332           0 :         goto out;
     333             :     }
     334             : 
     335           0 :     major_status = _gss_spnego_export_sec_context_internal(minor_status,
     336             :                                                            ctx,
     337             :                                                            interprocess_token);
     338             : 
     339           0 : out:
     340           0 :     if (major_status == GSS_S_COMPLETE)
     341           0 :         major_status = _gss_spnego_internal_delete_sec_context(minor_status,
     342             :                                                                context_handle,
     343             :                                                                GSS_C_NO_BUFFER);
     344             :     else
     345             :         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
     346             : 
     347           0 :     return major_status;
     348             : }
     349             : 
     350           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_import_sec_context (
     351             :             OM_uint32 * minor_status,
     352             :             const gss_buffer_t interprocess_token,
     353             :             gss_ctx_id_t *context_handle
     354             :            )
     355             : {
     356           0 :     return _gss_spnego_import_sec_context_internal(minor_status,
     357             :                                                    interprocess_token,
     358             :                                                    (gssspnego_ctx *)context_handle);
     359             : }
     360             : 
     361           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_inquire_names_for_mech (
     362             :             OM_uint32 * minor_status,
     363             :             const gss_OID mechanism,
     364             :             gss_OID_set * name_types
     365             :            )
     366             : {
     367           0 :     gss_OID_set mechs, names, n;
     368           0 :     OM_uint32 ret, junk;
     369           0 :     size_t i, j;
     370             : 
     371           0 :     *name_types = NULL;
     372             : 
     373           0 :     ret = _gss_spnego_indicate_mechs(minor_status, &mechs);
     374           0 :     if (ret != GSS_S_COMPLETE)
     375           0 :         return ret;
     376             : 
     377           0 :     ret = gss_create_empty_oid_set(minor_status, &names);
     378           0 :     if (ret != GSS_S_COMPLETE)
     379           0 :         goto out;
     380             : 
     381           0 :     for (i = 0; i < mechs->count; i++) {
     382           0 :         ret = gss_inquire_names_for_mech(minor_status,
     383           0 :                                          &mechs->elements[i],
     384             :                                          &n);
     385           0 :         if (ret)
     386           0 :             continue;
     387             : 
     388           0 :         for (j = 0; j < n->count; j++)
     389           0 :             gss_add_oid_set_member(minor_status,
     390           0 :                                    &n->elements[j],
     391             :                                    &names);
     392           0 :         gss_release_oid_set(&junk, &n);
     393             :     }
     394             : 
     395           0 :     ret = GSS_S_COMPLETE;
     396           0 :     *name_types = names;
     397           0 : out:
     398             : 
     399           0 :     gss_release_oid_set(&junk, &mechs);
     400             : 
     401           0 :     return ret;
     402             : }
     403             : 
     404             : OM_uint32 GSSAPI_CALLCONV
     405           0 : _gss_spnego_wrap_iov(OM_uint32 * minor_status,
     406             :                      gss_ctx_id_t  context_handle,
     407             :                      int conf_req_flag,
     408             :                      gss_qop_t qop_req,
     409             :                      int * conf_state,
     410             :                      gss_iov_buffer_desc *iov,
     411             :                      int iov_count)
     412             : {
     413           0 :     gssspnego_ctx ctx = (gssspnego_ctx)context_handle;
     414             : 
     415           0 :     *minor_status = 0;
     416             : 
     417           0 :     if (ctx == NULL || ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT)
     418           0 :         return GSS_S_NO_CONTEXT;
     419             : 
     420           0 :     return gss_wrap_iov(minor_status, ctx->negotiated_ctx_id,
     421             :                         conf_req_flag, qop_req, conf_state,
     422             :                         iov, iov_count);
     423             : }
     424             : 
     425             : OM_uint32 GSSAPI_CALLCONV
     426           0 : _gss_spnego_unwrap_iov(OM_uint32 *minor_status,
     427             :                        gss_ctx_id_t context_handle,
     428             :                        int *conf_state,
     429             :                        gss_qop_t *qop_state,
     430             :                        gss_iov_buffer_desc *iov,
     431             :                        int iov_count)
     432             : {
     433           0 :     gssspnego_ctx ctx = (gssspnego_ctx)context_handle;
     434             : 
     435           0 :     *minor_status = 0;
     436             : 
     437           0 :     if (ctx == NULL || ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT)
     438           0 :         return GSS_S_NO_CONTEXT;
     439             : 
     440           0 :     return gss_unwrap_iov(minor_status,
     441             :                           ctx->negotiated_ctx_id,
     442             :                           conf_state, qop_state,
     443             :                           iov, iov_count);
     444             : }
     445             : 
     446             : OM_uint32 GSSAPI_CALLCONV
     447           0 : _gss_spnego_wrap_iov_length(OM_uint32 * minor_status,
     448             :                             gss_ctx_id_t context_handle,
     449             :                             int conf_req_flag,
     450             :                             gss_qop_t qop_req,
     451             :                             int *conf_state,
     452             :                             gss_iov_buffer_desc *iov,
     453             :                             int iov_count)
     454             : {
     455           0 :     gssspnego_ctx ctx = (gssspnego_ctx)context_handle;
     456             : 
     457           0 :     *minor_status = 0;
     458             : 
     459           0 :     if (ctx == NULL || ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT)
     460           0 :         return GSS_S_NO_CONTEXT;
     461             : 
     462           0 :     return gss_wrap_iov_length(minor_status, ctx->negotiated_ctx_id,
     463             :                                conf_req_flag, qop_req, conf_state,
     464             :                                iov, iov_count);
     465             : }
     466             : 
     467             : #if 0
     468             : OM_uint32 GSSAPI_CALLCONV _gss_spnego_complete_auth_token
     469             :            (OM_uint32 * minor_status,
     470             :             gss_const_ctx_id_t context_handle,
     471             :             gss_buffer_t input_message_buffer)
     472             : {
     473             :     gssspnego_ctx ctx;
     474             : 
     475             :     *minor_status = 0;
     476             : 
     477             :     if (context_handle == GSS_C_NO_CONTEXT) {
     478             :         return GSS_S_NO_CONTEXT;
     479             :     }
     480             : 
     481             :     ctx = (gssspnego_ctx)context_handle;
     482             : 
     483             :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     484             :         return GSS_S_NO_CONTEXT;
     485             :     }
     486             : 
     487             :     return gss_complete_auth_token(minor_status,
     488             :                                    ctx->negotiated_ctx_id,
     489             :                                    input_message_buffer);
     490             : }
     491             : #endif
     492             : 
     493           0 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_inquire_sec_context_by_oid
     494             :            (OM_uint32 * minor_status,
     495             :             gss_const_ctx_id_t context_handle,
     496             :             const gss_OID desired_object,
     497             :             gss_buffer_set_t *data_set)
     498             : {
     499           0 :     gssspnego_ctx ctx;
     500             : 
     501           0 :     *minor_status = 0;
     502             : 
     503           0 :     if (context_handle == GSS_C_NO_CONTEXT) {
     504           0 :         return GSS_S_NO_CONTEXT;
     505             :     }
     506             : 
     507           0 :     ctx = (gssspnego_ctx)context_handle;
     508             : 
     509           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     510           0 :         return GSS_S_NO_CONTEXT;
     511             :     }
     512             : 
     513           0 :     return gss_inquire_sec_context_by_oid(minor_status,
     514           0 :                                           ctx->negotiated_ctx_id,
     515             :                                           desired_object,
     516             :                                           data_set);
     517             : }
     518             : 
     519      299604 : OM_uint32 GSSAPI_CALLCONV _gss_spnego_set_sec_context_option
     520             :            (OM_uint32 * minor_status,
     521             :             gss_ctx_id_t * context_handle,
     522             :             const gss_OID desired_object,
     523             :             const gss_buffer_t value)
     524             : {
     525       10214 :     gssspnego_ctx ctx;
     526             : 
     527      299604 :     *minor_status = 0;
     528             : 
     529             :     /*
     530             :      * Return GSS_S_UNAVAILABLE with a NULL context handle as at
     531             :      * present no context options can be set globally on SPNEGO
     532             :      * itself. Global mechanism context options are set directly
     533             :      * on the mechanism; per-context context options are set below
     534             :      * if ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT.
     535             :      */
     536      299604 :     if (context_handle == NULL || *context_handle == GSS_C_NO_CONTEXT)
     537      289390 :         return GSS_S_UNAVAILABLE;
     538             : 
     539           0 :     ctx = (gssspnego_ctx)*context_handle;
     540             : 
     541           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT) {
     542           0 :         return GSS_S_NO_CONTEXT;
     543             :     }
     544             : 
     545           0 :     return gss_set_sec_context_option(minor_status,
     546             :                                       &ctx->negotiated_ctx_id,
     547             :                                       desired_object,
     548             :                                       value);
     549             : }
     550             : 
     551             : 
     552             : OM_uint32 GSSAPI_CALLCONV
     553           0 : _gss_spnego_pseudo_random(OM_uint32 *minor_status,
     554             :                           gss_ctx_id_t context_handle,
     555             :                           int prf_key,
     556             :                           const gss_buffer_t prf_in,
     557             :                           ssize_t desired_output_len,
     558             :                           gss_buffer_t prf_out)
     559             : {
     560           0 :     gssspnego_ctx ctx;
     561             : 
     562           0 :     *minor_status = 0;
     563             : 
     564           0 :     if (context_handle == GSS_C_NO_CONTEXT)
     565           0 :         return GSS_S_NO_CONTEXT;
     566             : 
     567           0 :     ctx = (gssspnego_ctx)context_handle;
     568             : 
     569           0 :     if (ctx->negotiated_ctx_id == GSS_C_NO_CONTEXT)
     570           0 :         return GSS_S_NO_CONTEXT;
     571             : 
     572           0 :     return gss_pseudo_random(minor_status,
     573             :                              ctx->negotiated_ctx_id,
     574             :                              prf_key,
     575             :                              prf_in,
     576             :                              desired_output_len,
     577             :                              prf_out);
     578             : }

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