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