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         _gss_load_mech();
  63         if (mechs) {
  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         } else {
  77                 mechs = _gss_mech_oids;
  78         }
  79
  80         if (actual_mechs) {
  81                 major_status = gss_create_empty_oid_set(minor_status,
  82                     actual_mechs);
  83                 if (major_status)
  84                         return (major_status);
  85         }
  86
  87         cred = malloc(sizeof(struct _gss_cred));
  88         if (!cred) {
  89                 if (actual_mechs)
  90                         gss_release_oid_set(minor_status, actual_mechs);
  91                 *minor_status = ENOMEM;
  92                 return (GSS_S_FAILURE);
  93         }
  94         cred->gc_usage = cred_usage;
  95         SLIST_INIT(&cred->gc_mc);
  96
  97         set.count = 1;
  98         min_time = GSS_C_INDEFINITE;
  99         for (i = 0; i < mechs->count; i++) {
 100                 m = _gss_find_mech_switch(&mechs->elements[i]);
 101                 if (!m)
 102                         continue;
 103
 104                 if (desired_name != GSS_C_NO_NAME) {
 105                         mn = _gss_find_mn(name, &mechs->elements[i]);
 106                         if (!mn)
 107                                 continue;
 108                 }
 109
 110                 mc = malloc(sizeof(struct _gss_mechanism_cred));
 111                 if (!mc) {
 112                         continue;
 113                 }
 114                 mc->gmc_mech = m;
 115                 mc->gmc_mech_oid = &m->gm_mech_oid;
 116
 117                 /*
 118                  * XXX Probably need to do something with actual_mechs.
 119                  */
 120                 set.elements = &mechs->elements[i];
 121                 major_status = m->gm_acquire_cred(minor_status,
 122                     (desired_name != GSS_C_NO_NAME
 123                         ? mn->gmn_name : GSS_C_NO_NAME),
 124                     time_req, &set, cred_usage,
 125                     &mc->gmc_cred, NULL, &time);
 126                 if (major_status) {
 127                         free(mc);
 128                         continue;
 129                 }
 130                 if (time < min_time)
 131                         min_time = time;
 132
 133                 if (actual_mechs) {
 134                         major_status = gss_add_oid_set_member(minor_status,
 135                             mc->gmc_mech_oid, actual_mechs);
 136                         if (major_status) {
 137                                 m->gm_release_cred(minor_status,
 138                                     &mc->gmc_cred);
 139                                 free(mc);
 140                                 continue;
 141                         }
 142                 }
 143
 144                 SLIST_INSERT_HEAD(&cred->gc_mc, mc, gmc_link);
 145         }
 146
 147         /*
 148          * If we didn't manage to create a single credential, return
 149          * an error.
 150          */
 151         if (!SLIST_FIRST(&cred->gc_mc)) {
 152                 free(cred);
 153                 if (actual_mechs)
 154                         gss_release_oid_set(minor_status, actual_mechs);
 155                 *output_cred_handle = 0;
 156                 *minor_status = 0;
 157                 return (GSS_S_NO_CRED);
 158         }
 159
 160         if (time_rec)
 161                 *time_rec = min_time;
 162         *output_cred_handle = (gss_cred_id_t) cred;
 163         *minor_status = 0;
 164         return (GSS_S_COMPLETE);
 165 }