lib/libgssapi/gss_acquire_cred.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  *      $FreeBSD$
  27  */
  28
  29 #include <gssapi/gssapi.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32
  33 #include "mech_switch.h"
  34 #include "name.h"
  35 #include "cred.h"
  36
  37 OM_uint32
  38 gss_acquire_cred(OM_uint32 *minor_status,
  39     const gss_name_t desired_name,
  40     OM_uint32 time_req,
  41     const gss_OID_set desired_mechs,
  42     gss_cred_usage_t cred_usage,
  43     gss_cred_id_t *output_cred_handle,
  44     gss_OID_set *actual_mechs,
  45     OM_uint32 *time_rec)
  46 {
  47         OM_uint32 major_status;
  48         gss_OID_set mechs = desired_mechs;
  49         gss_OID_set_desc set;
  50         struct _gss_name *name = (struct _gss_name *) desired_name;
  51         struct _gss_mech_switch *m;
  52         struct _gss_cred *cred;
  53         struct _gss_mechanism_cred *mc;
  54         struct _gss_mechanism_name *mn;
  55         OM_uint32 min_time, time;
  56         int i;
  57
  58         /*
  59          * First make sure that at least one of the requested
  60          * mechanisms is one that we support.
  61          */
  62         if (mechs) {
  63                 _gss_load_mech();
  64                 for (i = 0; i < mechs->count; i++) {
  65                         int t;
  66                         gss_test_oid_set_member(minor_status,
  67                             &mechs->elements[i], _gss_mech_oids, &t);
  68                         if (t)
  69                                 break;
  70                 }
  71                 if (i == mechs->count) {
  72                         *output_cred_handle = 0;
  73                         *minor_status = 0;
  74                         return (GSS_S_BAD_MECH);
  75                 }
  76         }
  77
  78         if (actual_mechs) {
  79                 major_status = gss_create_empty_oid_set(minor_status,
  80                     actual_mechs);
  81                 if (major_status)
  82                         return (major_status);
  83         }
  84
  85         cred = malloc(sizeof(struct _gss_cred));
  86         if (!cred) {
  87                 if (actual_mechs)
  88                         gss_release_oid_set(minor_status, actual_mechs);
  89                 *minor_status = ENOMEM;
  90                 return (GSS_S_FAILURE);
  91         }
  92         cred->gc_usage = cred_usage;
  93         SLIST_INIT(&cred->gc_mc);
  94
  95         if (mechs == GSS_C_NO_OID_SET)
  96                 mechs = _gss_mech_oids;
  97
  98         set.count = 1;
  99         min_time = GSS_C_INDEFINITE;
 100         for (i = 0; i < mechs->count; i++) {
 101                 m = _gss_find_mech_switch(&mechs->elements[i]);
 102                 if (!m)
 103                         continue;
 104
 105                 if (desired_name != GSS_C_NO_NAME) {
 106                         mn = _gss_find_mn(name, &mechs->elements[i]);
 107                         if (!mn)
 108                                 continue;
 109                 }
 110
 111                 mc = malloc(sizeof(struct _gss_mechanism_cred));
 112                 if (!mc) {
 113                         continue;
 114                 }
 115                 mc->gmc_mech = m;
 116                 mc->gmc_mech_oid = &m->gm_mech_oid;
 117
 118                 /*
 119                  * XXX Probably need to do something with actual_mechs.
 120                  */
 121                 set.elements = &mechs->elements[i];
 122                 major_status = m->gm_acquire_cred(minor_status,
 123                     (desired_name != GSS_C_NO_NAME
 124                         ? mn->gmn_name : GSS_C_NO_NAME),
 125                     time_req, &set, cred_usage,
 126                     &mc->gmc_cred, NULL, &time);
 127                 if (major_status) {
 128                         free(mc);
 129                         continue;
 130                 }
 131                 if (time < min_time)
 132                         min_time = time;
 133
 134                 if (actual_mechs) {
 135                         major_status = gss_add_oid_set_member(minor_status,
 136                             mc->gmc_mech_oid, actual_mechs);
 137                         if (major_status) {
 138                                 m->gm_release_cred(minor_status,
 139                                     &mc->gmc_cred);
 140                                 free(mc);
 141                                 continue;
 142                         }
 143                 }
 144
 145                 SLIST_INSERT_HEAD(&cred->gc_mc, mc, gmc_link);
 146         }
 147
 148         /*
 149          * If we didn't manage to create a single credential, return
 150          * an error.
 151          */
 152         if (!SLIST_FIRST(&cred->gc_mc)) {
 153                 free(cred);
 154                 if (actual_mechs)
 155                         gss_release_oid_set(minor_status, actual_mechs);
 156                 *output_cred_handle = 0;
 157                 *minor_status = 0;
 158                 return (GSS_S_NO_CRED);
 159         }
 160
 161         if (time_rec)
 162                 *time_rec = min_time;
 163         *output_cred_handle = (gss_cred_id_t) cred;
 164         *minor_status = 0;
 165         return (GSS_S_COMPLETE);
 166 }