crypto/dist/heimdal/lib/krb5/ticket.c

   1 /*
   2  * Copyright (c) 1997 - 2001 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 "krb5_locl.h"
  35
  36 __RCSID("$Heimdal: ticket.c 19544 2006-12-28 20:49:18Z lha $"
  37         "$NetBSD$");
  38
  39 krb5_error_code KRB5_LIB_FUNCTION
  40 krb5_free_ticket(krb5_context context,
  41                  krb5_ticket *ticket)
  42 {
  43     free_EncTicketPart(&ticket->ticket);
  44     krb5_free_principal(context, ticket->client);
  45     krb5_free_principal(context, ticket->server);
  46     free(ticket);
  47     return 0;
  48 }
  49
  50 krb5_error_code KRB5_LIB_FUNCTION
  51 krb5_copy_ticket(krb5_context context,
  52                  const krb5_ticket *from,
  53                  krb5_ticket **to)
  54 {
  55     krb5_error_code ret;
  56     krb5_ticket *tmp;
  57
  58     *to = NULL;
  59     tmp = malloc(sizeof(*tmp));
  60     if(tmp == NULL) {
  61         krb5_set_error_string (context, "malloc: out of memory");
  62         return ENOMEM;
  63     }
  64     if((ret = copy_EncTicketPart(&from->ticket, &tmp->ticket))){
  65         free(tmp);
  66         return ret;
  67     }
  68     ret = krb5_copy_principal(context, from->client, &tmp->client);
  69     if(ret){
  70         free_EncTicketPart(&tmp->ticket);
  71         free(tmp);
  72         return ret;
  73     }
  74     ret = krb5_copy_principal(context, from->server, &tmp->server);
  75     if(ret){
  76         krb5_free_principal(context, tmp->client);
  77         free_EncTicketPart(&tmp->ticket);
  78         free(tmp);
  79         return ret;
  80     }
  81     *to = tmp;
  82     return 0;
  83 }
  84
  85 krb5_error_code KRB5_LIB_FUNCTION
  86 krb5_ticket_get_client(krb5_context context,
  87                        const krb5_ticket *ticket,
  88                        krb5_principal *client)
  89 {
  90     return krb5_copy_principal(context, ticket->client, client);
  91 }
  92
  93 krb5_error_code KRB5_LIB_FUNCTION
  94 krb5_ticket_get_server(krb5_context context,
  95                        const krb5_ticket *ticket,
  96                        krb5_principal *server)
  97 {
  98     return krb5_copy_principal(context, ticket->server, server);
  99 }
 100
 101 time_t KRB5_LIB_FUNCTION
 102 krb5_ticket_get_endtime(krb5_context context,
 103                         const krb5_ticket *ticket)
 104 {
 105     return ticket->ticket.endtime;
 106 }
 107
 108 static int
 109 find_type_in_ad(krb5_context context,
 110                 int type,
 111                 krb5_data *data,
 112                 krb5_boolean *found,
 113                 krb5_boolean failp,
 114                 krb5_keyblock *sessionkey,
 115                 const AuthorizationData *ad,
 116                 int level)
 117 {
 118     krb5_error_code ret = 0;
 119     int i;
 120
 121     if (level > 9) {
 122         krb5_set_error_string(context, "Authorization data nested deeper "
 123                               "then %d levels, stop searching", level);
 124         ret = ENOENT; /* XXX */
 125         goto out;
 126     }
 127
 128     /*
 129      * Only copy out the element the first time we get to it, we need
 130      * to run over the whole authorization data fields to check if
 131      * there are any container clases we need to care about.
 132      */
 133     for (i = 0; i < ad->len; i++) {
 134         if (!*found && ad->val[i].ad_type == type) {
 135             ret = der_copy_octet_string(&ad->val[i].ad_data, data);
 136             if (ret) {
 137                 krb5_set_error_string(context, "malloc - out of memory");
 138                 goto out;
 139             }
 140             *found = TRUE;
 141             continue;
 142         }
 143         switch (ad->val[i].ad_type) {
 144         case KRB5_AUTHDATA_IF_RELEVANT: {
 145             AuthorizationData child;
 146             ret = decode_AuthorizationData(ad->val[i].ad_data.data,
 147                                            ad->val[i].ad_data.length,
 148                                            &child,
 149                                            NULL);
 150             if (ret) {
 151                 krb5_set_error_string(context, "Failed to decode "
 152                                       "IF_RELEVANT with %d", ret);
 153                 goto out;
 154             }
 155             ret = find_type_in_ad(context, type, data, found, FALSE,
 156                                   sessionkey, &child, level + 1);
 157             free_AuthorizationData(&child);
 158             if (ret)
 159                 goto out;
 160             break;
 161         }
 162 #if 0 /* XXX test */
 163         case KRB5_AUTHDATA_KDC_ISSUED: {
 164             AD_KDCIssued child;
 165
 166             ret = decode_AD_KDCIssued(ad->val[i].ad_data.data,
 167                                       ad->val[i].ad_data.length,
 168                                       &child,
 169                                       NULL);
 170             if (ret) {
 171                 krb5_set_error_string(context, "Failed to decode "
 172                                       "AD_KDCIssued with %d", ret);
 173                 goto out;
 174             }
 175             if (failp) {
 176                 krb5_boolean valid;
 177                 krb5_data buf;
 178                 size_t len;
 179
 180                 ASN1_MALLOC_ENCODE(AuthorizationData, buf.data, buf.length,
 181                                    &child.elements, &len, ret);
 182                 if (ret) {
 183                     free_AD_KDCIssued(&child);
 184                     krb5_clear_error_string(context);
 185                     goto out;
 186                 }
 187                 if(buf.length != len)
 188                     krb5_abortx(context, "internal error in ASN.1 encoder");
 189
 190                 ret = krb5_c_verify_checksum(context, sessionkey, 19, &buf,
 191                                              &child.ad_checksum, &valid);
 192                 krb5_data_free(&buf);
 193                 if (ret) {
 194                     free_AD_KDCIssued(&child);
 195                     goto out;
 196                 }
 197                 if (!valid) {
 198                     krb5_clear_error_string(context);
 199                     ret = ENOENT;
 200                     free_AD_KDCIssued(&child);
 201                     goto out;
 202                 }
 203             }
 204             ret = find_type_in_ad(context, type, data, found, failp, sessionkey,
 205                                   &child.elements, level + 1);
 206             free_AD_KDCIssued(&child);
 207             if (ret)
 208                 goto out;
 209             break;
 210         }
 211 #endif
 212         case KRB5_AUTHDATA_AND_OR:
 213             if (!failp)
 214                 break;
 215             krb5_set_error_string(context, "Authorization data contains "
 216                                   "AND-OR element that is unknown to the "
 217                                   "application");
 218             ret = ENOENT; /* XXX */
 219             goto out;
 220         default:
 221             if (!failp)
 222                 break;
 223             krb5_set_error_string(context, "Authorization data contains "
 224                                   "unknown type (%d) ", ad->val[i].ad_type);
 225             ret = ENOENT; /* XXX */
 226             goto out;
 227         }
 228     }
 229 out:
 230     if (ret) {
 231         if (*found) {
 232             krb5_data_free(data);
 233             *found = 0;
 234         }
 235     }
 236     return ret;
 237 }
 238
 239 /*
 240  * Extract the authorization data type of `type' from the
 241  * 'ticket'. Store the field in `data'. This function is to use for
 242  * kerberos applications.
 243  */
 244
 245 krb5_error_code KRB5_LIB_FUNCTION
 246 krb5_ticket_get_authorization_data_type(krb5_context context,
 247                                         krb5_ticket *ticket,
 248                                         int type,
 249                                         krb5_data *data)
 250 {
 251     AuthorizationData *ad;
 252     krb5_error_code ret;
 253     krb5_boolean found = FALSE;
 254
 255     krb5_data_zero(data);
 256
 257     ad = ticket->ticket.authorization_data;
 258     if (ticket->ticket.authorization_data == NULL) {
 259         krb5_set_error_string(context, "Ticket have not authorization data");
 260         return ENOENT; /* XXX */
 261     }
 262
 263     ret = find_type_in_ad(context, type, data, &found, TRUE,
 264                           &ticket->ticket.key, ad, 0);
 265     if (ret)
 266         return ret;
 267     if (!found) {
 268         krb5_set_error_string(context, "Ticket have not authorization "
 269                           "data of type %d", type);
 270         return ENOENT; /* XXX */
 271     }
 272     return 0;
 273 }