lib/gssapi/mech/gss_import_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_import_sec_context.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
  27  */
  28
  29 #include "mech_locl.h"
  30
  31 OM_uint32 GSSAPI_LIB_FUNCTION
  32 gss_import_sec_context(OM_uint32 *minor_status,
  33     const gss_buffer_t interprocess_token,
  34     gss_ctx_id_t *context_handle)
  35 {
  36         OM_uint32 major_status;
  37         gssapi_mech_interface m;
  38         struct _gss_context *ctx;
  39         gss_OID_desc mech_oid;
  40         gss_buffer_desc buf;
  41         unsigned char *p;
  42         size_t len;
  43
  44         *minor_status = 0;
  45         *context_handle = GSS_C_NO_CONTEXT;
  46
  47         /*
  48          * We added an oid to the front of the token in
  49          * gss_export_sec_context.
  50          */
  51         p = interprocess_token->value;
  52         len = interprocess_token->length;
  53         if (len < 2)
  54                 return (GSS_S_DEFECTIVE_TOKEN);
  55         mech_oid.length = (p[0] << 8) | p[1];
  56         if (len < mech_oid.length + 2)
  57                 return (GSS_S_DEFECTIVE_TOKEN);
  58         mech_oid.elements = p + 2;
  59         buf.length = len - 2 - mech_oid.length;
  60         buf.value = p + 2 + mech_oid.length;
  61
  62         m = __gss_get_mechanism(&mech_oid);
  63         if (!m)
  64                 return (GSS_S_DEFECTIVE_TOKEN);
  65
  66         ctx = malloc(sizeof(struct _gss_context));
  67         if (!ctx) {
  68                 *minor_status = ENOMEM;
  69                 return (GSS_S_FAILURE);
  70         }
  71         ctx->gc_mech = m;
  72         major_status = m->gm_import_sec_context(minor_status,
  73             &buf, &ctx->gc_ctx);
  74         if (major_status != GSS_S_COMPLETE) {
  75                 _gss_mg_error(m, major_status, *minor_status);
  76                 free(ctx);
  77         } else {
  78                 *context_handle = (gss_ctx_id_t) ctx;
  79         }
  80
  81         return (major_status);
  82 }