lib/gssapi/mech/gss_duplicate_cred.c

   1 /*-
   2  * Copyright (c) 2005 Doug Rabson
   3  * Copyright (c) 2018 Kungliga Tekniska Högskolan
   4  * (Royal Institute of Technology, Stockholm, Sweden).
   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: src/lib/libgssapi/gss_add_cred.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
  29  */
  30
  31 #include "mech_locl.h"
  32
  33 static OM_uint32
  34 copy_cred_element(OM_uint32 *minor_status,
  35                   struct _gss_mechanism_cred *mc,
  36                   struct _gss_mechanism_cred **out)
  37 {
  38     gssapi_mech_interface m = mc->gmc_mech;
  39     OM_uint32 major_status, tmp;
  40     struct _gss_mechanism_cred *new_mc;
  41     OM_uint32 initiator_lifetime, acceptor_lifetime;
  42     gss_cred_usage_t cred_usage;
  43     gss_cred_id_t dup_cred = GSS_C_NO_CREDENTIAL;
  44
  45     *out = NULL;
  46
  47     if (m->gm_duplicate_cred) {
  48         major_status = m->gm_duplicate_cred(minor_status,
  49                                             mc->gmc_cred, &dup_cred);
  50     } else if (m->gm_import_cred && m->gm_export_cred) {
  51         gss_buffer_desc export;
  52
  53         major_status = m->gm_export_cred(minor_status, mc->gmc_cred, &export);
  54         if (major_status == GSS_S_COMPLETE) {
  55             major_status = m->gm_import_cred(minor_status, &export, &dup_cred);
  56             gss_release_buffer(&tmp, &export);
  57         }
  58     } else {
  59         struct _gss_mechanism_name mn;
  60
  61         mn.gmn_mech = m;
  62         mn.gmn_mech_oid = mc->gmc_mech_oid;
  63         mn.gmn_name = GSS_C_NO_NAME;
  64
  65         /* This path won't work for ephemeral creds or cred stores */
  66         major_status = m->gm_inquire_cred_by_mech(minor_status, mc->gmc_cred,
  67                                                   mc->gmc_mech_oid, &mn.gmn_name,
  68                                                   &initiator_lifetime,
  69                                                   &acceptor_lifetime, &cred_usage);
  70         if (major_status == GSS_S_COMPLETE) {
  71             major_status = _gss_mg_add_mech_cred(minor_status,
  72                                                  m,
  73                                                  NULL, /* mc */
  74                                                  &mn,
  75                                                  cred_usage,
  76                                                  initiator_lifetime,
  77                                                  acceptor_lifetime,
  78                                                  GSS_C_NO_CRED_STORE,
  79                                                  &new_mc,
  80                                                  NULL,
  81                                                  NULL);
  82             m->gm_release_name(&tmp, &mn.gmn_name);
  83         }
  84     }
  85
  86     if (major_status == GSS_S_COMPLETE) {
  87         new_mc = calloc(1, sizeof(*new_mc));
  88         if (new_mc == NULL) {
  89             *minor_status = ENOMEM;
  90             m->gm_release_cred(&tmp, &dup_cred);
  91             return GSS_S_FAILURE;
  92         }
  93
  94         new_mc->gmc_mech = m;
  95         new_mc->gmc_mech_oid = mc->gmc_mech_oid;
  96         new_mc->gmc_cred = dup_cred;
  97
  98         *out = new_mc;
  99     } else
 100         _gss_mg_error(m, *minor_status);
 101
 102     return major_status;
 103 }
 104
 105 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 106 gss_duplicate_cred(OM_uint32 *minor_status,
 107                    gss_const_cred_id_t input_cred_handle,
 108                    gss_cred_id_t *output_cred_handle)
 109 {
 110     struct _gss_mechanism_cred *mc;
 111     struct _gss_cred *new_cred;
 112     struct _gss_cred *cred = (struct _gss_cred *)input_cred_handle;
 113     OM_uint32 major_status, junk;
 114
 115     if (input_cred_handle == GSS_C_NO_CREDENTIAL) {
 116         /*
 117          * "Copy" the default credential by acquiring a cred handle for the
 118          * default credential's name, GSS_C_NO_NAME.
 119          */
 120         return gss_acquire_cred(minor_status, GSS_C_NO_NAME, GSS_C_INDEFINITE,
 121                                 GSS_C_NO_OID_SET, GSS_C_BOTH,
 122                                 output_cred_handle, NULL, NULL);
 123     }
 124
 125     *output_cred_handle = GSS_C_NO_CREDENTIAL;
 126     new_cred = _gss_mg_alloc_cred();
 127     if (!new_cred) {
 128         *minor_status = ENOMEM;
 129         return GSS_S_FAILURE;
 130     }
 131
 132     *minor_status = 0;
 133     major_status = GSS_S_NO_CRED;
 134
 135     HEIM_SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
 136         struct _gss_mechanism_cred *copy_mc;
 137
 138         major_status = copy_cred_element(minor_status, mc, &copy_mc);
 139         if (major_status != GSS_S_COMPLETE)
 140             break;
 141
 142         HEIM_SLIST_INSERT_HEAD(&new_cred->gc_mc, copy_mc, gmc_link);
 143     }
 144
 145     if (major_status != GSS_S_COMPLETE) {
 146         gss_cred_id_t release_cred = (gss_cred_id_t)new_cred;
 147         gss_release_cred(&junk, &release_cred);
 148         new_cred = NULL;
 149     }
 150
 151     *output_cred_handle = (gss_cred_id_t)new_cred;
 152     return major_status;
 153 }