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("$Id$");
  31
  32 static gss_cred_id_t
  33 _gss_mech_cred_find(gss_cred_id_t cred_handle, gss_OID mech_type)
  34 {
  35         struct _gss_cred *cred = (struct _gss_cred *)cred_handle;
  36         struct _gss_mechanism_cred *mc;
  37
  38         if (cred == NULL)
  39                 return GSS_C_NO_CREDENTIAL;
  40
  41         SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
  42                 if (gss_oid_equal(mech_type, mc->gmc_mech_oid))
  43                         return mc->gmc_cred;
  44         }
  45         return GSS_C_NO_CREDENTIAL;
  46 }
  47
  48 OM_uint32 GSSAPI_LIB_FUNCTION
  49 gss_init_sec_context(OM_uint32 * minor_status,
  50     const gss_cred_id_t initiator_cred_handle,
  51     gss_ctx_id_t * context_handle,
  52     const gss_name_t target_name,
  53     const gss_OID input_mech_type,
  54     OM_uint32 req_flags,
  55     OM_uint32 time_req,
  56     const gss_channel_bindings_t input_chan_bindings,
  57     const gss_buffer_t input_token,
  58     gss_OID * actual_mech_type,
  59     gss_buffer_t output_token,
  60     OM_uint32 * ret_flags,
  61     OM_uint32 * time_rec)
  62 {
  63         OM_uint32 major_status;
  64         gssapi_mech_interface m;
  65         struct _gss_name *name = (struct _gss_name *) target_name;
  66         struct _gss_mechanism_name *mn;
  67         struct _gss_context *ctx = (struct _gss_context *) *context_handle;
  68         gss_cred_id_t cred_handle;
  69         int allocated_ctx;
  70         gss_OID mech_type = input_mech_type;
  71
  72         *minor_status = 0;
  73
  74         _mg_buffer_zero(output_token);
  75         if (actual_mech_type)
  76             *actual_mech_type = GSS_C_NO_OID;
  77         if (ret_flags)
  78             *ret_flags = 0;
  79         if (time_rec)
  80             *time_rec = 0;
  81
  82         /*
  83          * If we haven't allocated a context yet, do so now and lookup
  84          * the mechanism switch table. If we have one already, make
  85          * sure we use the same mechanism switch as before.
  86          */
  87         if (!ctx) {
  88                 if (mech_type == NULL)
  89                         mech_type = GSS_KRB5_MECHANISM;
  90
  91                 ctx = malloc(sizeof(struct _gss_context));
  92                 if (!ctx) {
  93                         *minor_status = ENOMEM;
  94                         return (GSS_S_FAILURE);
  95                 }
  96                 memset(ctx, 0, sizeof(struct _gss_context));
  97                 m = ctx->gc_mech = __gss_get_mechanism(mech_type);
  98                 if (!m) {
  99                         free(ctx);
 100                         return (GSS_S_BAD_MECH);
 101                 }
 102                 allocated_ctx = 1;
 103         } else {
 104                 m = ctx->gc_mech;
 105                 mech_type = &ctx->gc_mech->gm_mech_oid;
 106                 allocated_ctx = 0;
 107         }
 108
 109         /*
 110          * Find the MN for this mechanism.
 111          */
 112         major_status = _gss_find_mn(minor_status, name, mech_type, &mn);
 113         if (major_status != GSS_S_COMPLETE) {
 114                 if (allocated_ctx)
 115                         free(ctx);
 116                 return major_status;
 117         }
 118
 119         /*
 120          * If we have a cred, find the cred for this mechanism.
 121          */
 122         cred_handle = _gss_mech_cred_find(initiator_cred_handle, mech_type);
 123
 124         major_status = m->gm_init_sec_context(minor_status,
 125             cred_handle,
 126             &ctx->gc_ctx,
 127             mn->gmn_name,
 128             mech_type,
 129             req_flags,
 130             time_req,
 131             input_chan_bindings,
 132             input_token,
 133             actual_mech_type,
 134             output_token,
 135             ret_flags,
 136             time_rec);
 137
 138         if (major_status != GSS_S_COMPLETE
 139             && major_status != GSS_S_CONTINUE_NEEDED) {
 140                 if (allocated_ctx)
 141                         free(ctx);
 142                 _mg_buffer_zero(output_token);
 143                 _gss_mg_error(m, major_status, *minor_status);
 144         } else {
 145                 *context_handle = (gss_ctx_id_t) ctx;
 146         }
 147
 148         return (major_status);
 149 }