lib/gssapi/add_cred.c

   1 /*
   2  * Copyright (c) 2003 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "gssapi_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 OM_uint32 gss_add_cred (
  39      OM_uint32           *minor_status,
  40      const gss_cred_id_t input_cred_handle,
  41      const gss_name_t    desired_name,
  42      const gss_OID       desired_mech,
  43      gss_cred_usage_t    cred_usage,
  44      OM_uint32           initiator_time_req,
  45      OM_uint32           acceptor_time_req,
  46      gss_cred_id_t       *output_cred_handle,
  47      gss_OID_set         *actual_mechs,
  48      OM_uint32           *initiator_time_rec,
  49      OM_uint32           *acceptor_time_rec)
  50 {
  51     OM_uint32 ret, lifetime;
  52     gss_cred_id_t cred, handle;
  53
  54     handle = NULL;
  55     cred = input_cred_handle;
  56
  57     if (gss_oid_equal(desired_mech, GSS_KRB5_MECHANISM) == 0) {
  58         *minor_status = 0;
  59         return GSS_S_BAD_MECH;
  60     }
  61
  62     if (cred == GSS_C_NO_CREDENTIAL && output_cred_handle == NULL) {
  63         *minor_status = 0;
  64         return GSS_S_NO_CRED;
  65     }
  66
  67     /* check if requested output usage is compatible with output usage */
  68     if (output_cred_handle != NULL &&
  69         (cred->usage != cred_usage && cred->usage != GSS_C_BOTH)) {
  70         *minor_status = GSS_KRB5_S_G_BAD_USAGE;
  71         return(GSS_S_FAILURE);
  72     }
  73
  74     /* check that we have the same name */
  75     if (desired_name != GSS_C_NO_NAME &&
  76         krb5_principal_compare(gssapi_krb5_context, desired_name,
  77                                cred->principal) != FALSE) {
  78         *minor_status = 0;
  79         return GSS_S_BAD_NAME;
  80     }
  81
  82     /* make a copy */
  83     if (output_cred_handle) {
  84
  85         handle = (gss_cred_id_t)malloc(sizeof(*handle));
  86         if (handle == GSS_C_NO_CREDENTIAL) {
  87             *minor_status = ENOMEM;
  88             return (GSS_S_FAILURE);
  89         }
  90
  91         memset(handle, 0, sizeof (*handle));
  92
  93         handle->usage = cred_usage;
  94         handle->lifetime = cred->lifetime;
  95         handle->principal = NULL;
  96         handle->keytab = NULL;
  97         handle->ccache = NULL;
  98         handle->mechanisms = NULL;
  99
 100         ret = GSS_S_FAILURE;
 101
 102         ret = gss_duplicate_name(minor_status, cred->principal,
 103                                  &handle->principal);
 104         if (ret) {
 105             free(handle);
 106             *minor_status = ENOMEM;
 107             return GSS_S_FAILURE;
 108         }
 109
 110         if (cred->keytab) {
 111             krb5_error_code kret;
 112             char name[KRB5_KT_PREFIX_MAX_LEN + MAXPATHLEN];
 113             int len;
 114
 115             ret = GSS_S_FAILURE;
 116
 117             kret = krb5_kt_get_type(gssapi_krb5_context, cred->keytab,
 118                                     name, KRB5_KT_PREFIX_MAX_LEN);
 119             if (kret) {
 120                 *minor_status = kret;
 121                 goto failure;
 122             }
 123             len = strlen(name);
 124             name[len++] = ':';
 125
 126             kret = krb5_kt_get_name(gssapi_krb5_context, cred->keytab,
 127                                     name + len,
 128                                     sizeof(name) - len);
 129             if (kret) {
 130                 *minor_status = kret;
 131                 goto failure;
 132             }
 133
 134             kret = krb5_kt_resolve(gssapi_krb5_context, name,
 135                                    &handle->keytab);
 136             if (kret){
 137                 *minor_status = kret;
 138                 goto failure;
 139             }
 140         }
 141
 142         if (cred->ccache) {
 143             krb5_error_code kret;
 144             const char *type, *name;
 145             char *type_name;
 146
 147             ret = GSS_S_FAILURE;
 148
 149             type = krb5_cc_get_type(gssapi_krb5_context, cred->ccache);
 150             if (type == NULL){
 151                 *minor_status = ENOMEM;
 152                 goto failure;
 153             }
 154
 155             if (strcmp(type, "MEMORY") == 0) {
 156                 ret = krb5_cc_gen_new(gssapi_krb5_context, &krb5_mcc_ops,
 157                                       &handle->ccache);
 158                 if (ret) {
 159                     *minor_status = ret;
 160                     goto failure;
 161                 }
 162
 163                 ret = krb5_cc_copy_cache(gssapi_krb5_context, cred->ccache,
 164                                          handle->ccache);
 165                 if (ret) {
 166                     *minor_status = ret;
 167                     goto failure;
 168                 }
 169
 170             } else {
 171
 172                 name = krb5_cc_get_name(gssapi_krb5_context, cred->ccache);
 173                 if (name == NULL) {
 174                     *minor_status = ENOMEM;
 175                     goto failure;
 176                 }
 177
 178                 asprintf(&type_name, "%s:%s", type, name);
 179                 if (type_name == NULL) {
 180                     *minor_status = ENOMEM;
 181                     goto failure;
 182                 }
 183
 184                 kret = krb5_cc_resolve(gssapi_krb5_context, type_name,
 185                                        &handle->ccache);
 186                 free(type_name);
 187                 if (kret) {
 188                     *minor_status = kret;
 189                     goto failure;
 190                 }
 191             }
 192         }
 193
 194         ret = gss_create_empty_oid_set(minor_status, &handle->mechanisms);
 195         if (ret)
 196             goto failure;
 197
 198         ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
 199                                      &handle->mechanisms);
 200         if (ret)
 201             goto failure;
 202     }
 203
 204     ret = gss_inquire_cred(minor_status, cred, NULL, &lifetime,
 205                            NULL, actual_mechs);
 206     if (ret)
 207         goto failure;
 208
 209     if (initiator_time_rec)
 210         *initiator_time_rec = lifetime;
 211     if (acceptor_time_rec)
 212         *acceptor_time_rec = lifetime;
 213
 214     if (output_cred_handle)
 215         *output_cred_handle = handle;
 216
 217     *minor_status = 0;
 218     return ret;
 219
 220  failure:
 221
 222     if (handle) {
 223         if (handle->principal)
 224             gss_release_name(NULL, &handle->principal);
 225         if (handle->keytab)
 226             krb5_kt_close(gssapi_krb5_context, handle->keytab);
 227         if (handle->ccache)
 228             krb5_cc_destroy(gssapi_krb5_context, handle->ccache);
 229         if (handle->mechanisms)
 230             gss_release_oid_set(NULL, &handle->mechanisms);
 231         free(handle);
 232     }
 233     return ret;
 234 }