source/heimdal/lib/gssapi/mech/gss_init_sec_context.c

   1 /*-
   2  * Copyright (c) 2005 Doug Rabson
   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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      $FreeBSD: src/lib/libgssapi/gss_init_sec_context.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
  27  */
  28
  29 #include "mech_locl.h"
  30 RCSID("$Id: gss_init_sec_context.c,v 1.3 2006/07/06 22:30:09 lha Exp $");
  31
  32 OM_uint32
  33 gss_init_sec_context(OM_uint32 * minor_status,
  34     const gss_cred_id_t initiator_cred_handle,
  35     gss_ctx_id_t * context_handle,
  36     const gss_name_t target_name,
  37     const gss_OID input_mech_type,
  38     OM_uint32 req_flags,
  39     OM_uint32 time_req,
  40     const gss_channel_bindings_t input_chan_bindings,
  41     const gss_buffer_t input_token,
  42     gss_OID * actual_mech_type,
  43     gss_buffer_t output_token,
  44     OM_uint32 * ret_flags,
  45     OM_uint32 * time_rec)
  46 {
  47         OM_uint32 major_status;
  48         gssapi_mech_interface m;
  49         struct _gss_name *name = (struct _gss_name *) target_name;
  50         struct _gss_mechanism_name *mn;
  51         struct _gss_context *ctx = (struct _gss_context *) *context_handle;
  52         struct _gss_cred *cred = (struct _gss_cred *) initiator_cred_handle;
  53         struct _gss_mechanism_cred *mc;
  54         gss_cred_id_t cred_handle;
  55         int allocated_ctx;
  56         gss_OID mech_type = input_mech_type;
  57
  58         *minor_status = 0;
  59
  60         /*
  61          * If we haven't allocated a context yet, do so now and lookup
  62          * the mechanism switch table. If we have one already, make
  63          * sure we use the same mechanism switch as before.
  64          */
  65         if (!ctx) {
  66                 if (mech_type == NULL)
  67                         mech_type = GSS_KRB5_MECHANISM;
  68
  69                 ctx = malloc(sizeof(struct _gss_context));
  70                 if (!ctx) {
  71                         *minor_status = ENOMEM;
  72                         return (GSS_S_FAILURE);
  73                 }
  74                 memset(ctx, 0, sizeof(struct _gss_context));
  75                 m = ctx->gc_mech = __gss_get_mechanism(mech_type);
  76                 if (!m) {
  77                         free(ctx);
  78                         return (GSS_S_BAD_MECH);
  79                 }
  80                 allocated_ctx = 1;
  81         } else {
  82                 m = ctx->gc_mech;
  83                 mech_type = &ctx->gc_mech->gm_mech_oid;
  84                 allocated_ctx = 0;
  85         }
  86
  87         /*
  88          * Find the MN for this mechanism.
  89          */
  90         mn = _gss_find_mn(name, mech_type);
  91         if (mn == NULL) {
  92                 if (allocated_ctx)
  93                         free(ctx);
  94                 return GSS_S_BAD_NAME;
  95         }
  96
  97         /*
  98          * If we have a cred, find the cred for this mechanism.
  99          */
 100         cred_handle = GSS_C_NO_CREDENTIAL;
 101         if (cred) {
 102                 SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
 103                         if (gss_oid_equal(mech_type, mc->gmc_mech_oid)) {
 104                                 cred_handle = mc->gmc_cred;
 105                                 break;
 106                         }
 107                 }
 108         }
 109
 110         major_status = m->gm_init_sec_context(minor_status,
 111             cred_handle,
 112             &ctx->gc_ctx,
 113             mn->gmn_name,
 114             mech_type,
 115             req_flags,
 116             time_req,
 117             input_chan_bindings,
 118             input_token,
 119             actual_mech_type,
 120             output_token,
 121             ret_flags,
 122             time_rec);
 123
 124         if (major_status != GSS_S_COMPLETE
 125             && major_status != GSS_S_CONTINUE_NEEDED) {
 126                 if (allocated_ctx)
 127                         free(ctx);
 128         } else {
 129                 *context_handle = (gss_ctx_id_t) ctx;
 130         }
 131
 132         return (major_status);
 133 }