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
  31 static gss_cred_id_t
  32 _gss_mech_cred_find(gss_cred_id_t cred_handle, gss_OID mech_type)
  33 {
  34         struct _gss_cred *cred = (struct _gss_cred *)cred_handle;
  35         struct _gss_mechanism_cred *mc;
  36
  37         if (cred == NULL)
  38                 return GSS_C_NO_CREDENTIAL;
  39
  40         SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
  41                 if (gss_oid_equal(mech_type, mc->gmc_mech_oid))
  42                         return mc->gmc_cred;
  43         }
  44         return GSS_C_NO_CREDENTIAL;
  45 }
  46
  47 OM_uint32 GSSAPI_LIB_FUNCTION
  48 gss_init_sec_context(OM_uint32 * minor_status,
  49     const gss_cred_id_t initiator_cred_handle,
  50     gss_ctx_id_t * context_handle,
  51     const gss_name_t target_name,
  52     const gss_OID input_mech_type,
  53     OM_uint32 req_flags,
  54     OM_uint32 time_req,
  55     const gss_channel_bindings_t input_chan_bindings,
  56     const gss_buffer_t input_token,
  57     gss_OID * actual_mech_type,
  58     gss_buffer_t output_token,
  59     OM_uint32 * ret_flags,
  60     OM_uint32 * time_rec)
  61 {
  62         OM_uint32 major_status;
  63         gssapi_mech_interface m;
  64         struct _gss_name *name = (struct _gss_name *) target_name;
  65         struct _gss_mechanism_name *mn;
  66         struct _gss_context *ctx = (struct _gss_context *) *context_handle;
  67         gss_cred_id_t cred_handle;
  68         int allocated_ctx;
  69         gss_OID mech_type = input_mech_type;
  70
  71         *minor_status = 0;
  72
  73         _mg_buffer_zero(output_token);
  74         if (actual_mech_type)
  75             *actual_mech_type = GSS_C_NO_OID;
  76         if (ret_flags)
  77             *ret_flags = 0;
  78         if (time_rec)
  79             *time_rec = 0;
  80
  81         /*
  82          * If we haven't allocated a context yet, do so now and lookup
  83          * the mechanism switch table. If we have one already, make
  84          * sure we use the same mechanism switch as before.
  85          */
  86         if (!ctx) {
  87                 if (mech_type == NULL)
  88                         mech_type = GSS_KRB5_MECHANISM;
  89
  90                 ctx = malloc(sizeof(struct _gss_context));
  91                 if (!ctx) {
  92                         *minor_status = ENOMEM;
  93                         return (GSS_S_FAILURE);
  94                 }
  95                 memset(ctx, 0, sizeof(struct _gss_context));
  96                 m = ctx->gc_mech = __gss_get_mechanism(mech_type);
  97                 if (!m) {
  98                         free(ctx);
  99                         return (GSS_S_BAD_MECH);
 100                 }
 101                 allocated_ctx = 1;
 102         } else {
 103                 m = ctx->gc_mech;
 104                 mech_type = &ctx->gc_mech->gm_mech_oid;
 105                 allocated_ctx = 0;
 106         }
 107
 108         /*
 109          * Find the MN for this mechanism.
 110          */
 111         major_status = _gss_find_mn(minor_status, name, mech_type, &mn);
 112         if (major_status != GSS_S_COMPLETE) {
 113                 if (allocated_ctx)
 114                         free(ctx);
 115                 return major_status;
 116         }
 117
 118         /*
 119          * If we have a cred, find the cred for this mechanism.
 120          */
 121         if (m->gm_flags & GM_USE_MG_CRED)
 122                 cred_handle = initiator_cred_handle;
 123         else
 124                 cred_handle = _gss_mech_cred_find(initiator_cred_handle, mech_type);
 125
 126         major_status = m->gm_init_sec_context(minor_status,
 127             cred_handle,
 128             &ctx->gc_ctx,
 129             mn->gmn_name,
 130             mech_type,
 131             req_flags,
 132             time_req,
 133             input_chan_bindings,
 134             input_token,
 135             actual_mech_type,
 136             output_token,
 137             ret_flags,
 138             time_rec);
 139
 140         if (major_status != GSS_S_COMPLETE
 141             && major_status != GSS_S_CONTINUE_NEEDED) {
 142                 if (allocated_ctx)
 143                         free(ctx);
 144                 _mg_buffer_zero(output_token);
 145                 _gss_mg_error(m, major_status, *minor_status);
 146         } else {
 147                 *context_handle = (gss_ctx_id_t) ctx;
 148         }
 149
 150         return (major_status);
 151 }