lib/libgssapi/gss_acquire_cred.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2005 Doug Rabson
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  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  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  *      $FreeBSD$
  29  */
  30
  31 #include <gssapi/gssapi.h>
  32 #include <stdlib.h>
  33 #include <errno.h>
  34
  35 #include "mech_switch.h"
  36 #include "name.h"
  37 #include "cred.h"
  38
  39 OM_uint32
  40 gss_acquire_cred(OM_uint32 *minor_status,
  41     const gss_name_t desired_name,
  42     OM_uint32 time_req,
  43     const gss_OID_set desired_mechs,
  44     gss_cred_usage_t cred_usage,
  45     gss_cred_id_t *output_cred_handle,
  46     gss_OID_set *actual_mechs,
  47     OM_uint32 *time_rec)
  48 {
  49         OM_uint32 major_status;
  50         gss_OID_set mechs = desired_mechs;
  51         gss_OID_set_desc set;
  52         struct _gss_name *name = (struct _gss_name *) desired_name;
  53         struct _gss_mech_switch *m;
  54         struct _gss_cred *cred;
  55         struct _gss_mechanism_cred *mc;
  56         struct _gss_mechanism_name *mn;
  57         OM_uint32 min_time, cred_time;
  58         size_t i;
  59
  60         *minor_status = 0;
  61         if (output_cred_handle)
  62                 *output_cred_handle = GSS_C_NO_CREDENTIAL;
  63         if (actual_mechs)
  64                 *actual_mechs = GSS_C_NO_OID_SET;
  65         if (time_rec)
  66                 *time_rec = 0;
  67
  68         _gss_load_mech();
  69
  70         /*
  71          * First make sure that at least one of the requested
  72          * mechanisms is one that we support.
  73          */
  74         if (mechs) {
  75                 for (i = 0; i < mechs->count; i++) {
  76                         int t;
  77                         gss_test_oid_set_member(minor_status,
  78                             &mechs->elements[i], _gss_mech_oids, &t);
  79                         if (t)
  80                                 break;
  81                 }
  82                 if (i == mechs->count) {
  83                         *minor_status = 0;
  84                         return (GSS_S_BAD_MECH);
  85                 }
  86         } else {
  87                 mechs = _gss_mech_oids;
  88         }
  89
  90         if (actual_mechs) {
  91                 major_status = gss_create_empty_oid_set(minor_status,
  92                     actual_mechs);
  93                 if (major_status)
  94                         return (major_status);
  95         }
  96
  97         cred = malloc(sizeof(struct _gss_cred));
  98         if (!cred) {
  99                 if (actual_mechs)
 100                         gss_release_oid_set(minor_status, actual_mechs);
 101                 *minor_status = ENOMEM;
 102                 return (GSS_S_FAILURE);
 103         }
 104         SLIST_INIT(&cred->gc_mc);
 105
 106         set.count = 1;
 107         min_time = GSS_C_INDEFINITE;
 108         for (i = 0; i < mechs->count; i++) {
 109                 m = _gss_find_mech_switch(&mechs->elements[i]);
 110                 if (!m)
 111                         continue;
 112
 113                 if (desired_name != GSS_C_NO_NAME) {
 114                         major_status = _gss_find_mn(minor_status, name,
 115                                                     &mechs->elements[i], &mn);
 116                         if (major_status != GSS_S_COMPLETE)
 117                                 continue;
 118                 }
 119
 120                 mc = malloc(sizeof(struct _gss_mechanism_cred));
 121                 if (!mc) {
 122                         continue;
 123                 }
 124                 mc->gmc_mech = m;
 125                 mc->gmc_mech_oid = &m->gm_mech_oid;
 126
 127                 /*
 128                  * XXX Probably need to do something with actual_mechs.
 129                  */
 130                 set.elements = &mechs->elements[i];
 131                 major_status = m->gm_acquire_cred(minor_status,
 132                     (desired_name != GSS_C_NO_NAME
 133                         ? mn->gmn_name : GSS_C_NO_NAME),
 134                     time_req, &set, cred_usage,
 135                     &mc->gmc_cred, NULL, &cred_time);
 136                 if (major_status) {
 137                         free(mc);
 138                         continue;
 139                 }
 140                 if (cred_time < min_time)
 141                         min_time = cred_time;
 142
 143                 if (actual_mechs) {
 144                         major_status = gss_add_oid_set_member(minor_status,
 145                             mc->gmc_mech_oid, actual_mechs);
 146                         if (major_status) {
 147                                 m->gm_release_cred(minor_status,
 148                                     &mc->gmc_cred);
 149                                 free(mc);
 150                                 continue;
 151                         }
 152                 }
 153
 154                 SLIST_INSERT_HEAD(&cred->gc_mc, mc, gmc_link);
 155         }
 156
 157         /*
 158          * If we didn't manage to create a single credential, return
 159          * an error.
 160          */
 161         if (!SLIST_FIRST(&cred->gc_mc)) {
 162                 free(cred);
 163                 if (actual_mechs)
 164                         gss_release_oid_set(minor_status, actual_mechs);
 165                 *minor_status = 0;
 166                 return (GSS_S_NO_CRED);
 167         }
 168
 169         if (time_rec)
 170                 *time_rec = min_time;
 171         *output_cred_handle = (gss_cred_id_t) cred;
 172         *minor_status = 0;
 173         return (GSS_S_COMPLETE);
 174 }