source/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("$Id: ticket.c,v 1.15 2006/10/14 09:53:19 lha Exp $");
  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 static int
 101 find_type_in_ad(krb5_context context,
 102                 int type,
 103                 krb5_data *data,
 104                 krb5_boolean *found,
 105                 krb5_boolean failp,
 106                 krb5_keyblock *sessionkey,
 107                 const AuthorizationData *ad,
 108                 int level)
 109 {
 110     /* It is not an error if nothing in here, that is reported by *found */
 111     /* Setting a default error causes found to be set to FALSE, on
 112      * recursion to an second embedded authz data even if the first
 113      * element contains the required type */
 114     krb5_error_code ret = 0;
 115     int i;
 116
 117     if (level > 9) {
 118         krb5_set_error_string(context, "Authorization data nested deeper "
 119                               "then %d levels, stop searching", level);
 120         ret = ENOENT; /* XXX */
 121         goto out;
 122     }
 123
 124     /*
 125      * Only copy out the element the first time we get to it, we need
 126      * to run over the whole authorization data fields to check if
 127      * there are any container clases we need to care about.
 128      */
 129     for (i = 0; i < ad->len; i++) {
 130         if (!*found && ad->val[i].ad_type == type) {
 131             ret = der_copy_octet_string(&ad->val[i].ad_data, data);
 132             if (ret) {
 133                 krb5_set_error_string(context, "malloc - out of memory");
 134                 goto out;
 135             }
 136             *found = TRUE;
 137             continue;
 138         }
 139         switch (ad->val[i].ad_type) {
 140         case KRB5_AUTHDATA_IF_RELEVANT: {
 141             AuthorizationData child;
 142             ret = decode_AuthorizationData(ad->val[i].ad_data.data,
 143                                            ad->val[i].ad_data.length,
 144                                            &child,
 145                                            NULL);
 146             if (ret) {
 147                 krb5_set_error_string(context, "Failed to decode "
 148                                       "IF_RELEVANT with %d", ret);
 149                 goto out;
 150             }
 151             ret = find_type_in_ad(context, type, data, found, 0, sessionkey,
 152                                   &child, level + 1);
 153             free_AuthorizationData(&child);
 154             if (ret)
 155                 goto out;
 156             break;
 157         }
 158 #if 0 /* XXX test */
 159         case KRB5_AUTHDATA_KDC_ISSUED: {
 160             AD_KDCIssued child;
 161
 162             ret = decode_AD_KDCIssued(ad->val[i].ad_data.data,
 163                                       ad->val[i].ad_data.length,
 164                                       &child,
 165                                       NULL);
 166             if (ret) {
 167                 krb5_set_error_string(context, "Failed to decode "
 168                                       "AD_KDCIssued with %d", ret);
 169                 goto out;
 170             }
 171             if (failp) {
 172                 krb5_boolean valid;
 173                 krb5_data buf;
 174                 size_t len;
 175
 176                 ASN1_MALLOC_ENCODE(AuthorizationData, buf.data, buf.length,
 177                                    &child.elements, &len, ret);
 178                 if (ret) {
 179                     free_AD_KDCIssued(&child);
 180                     krb5_clear_error_string(context);
 181                     goto out;
 182                 }
 183                 if(buf.length != len)
 184                     krb5_abortx(context, "internal error in ASN.1 encoder");
 185
 186                 ret = krb5_c_verify_checksum(context, sessionkey, 19, &buf,
 187                                              &child.ad_checksum, &valid);
 188                 krb5_data_free(&buf);
 189                 if (ret) {
 190                     free_AD_KDCIssued(&child);
 191                     goto out;
 192                 }
 193                 if (!valid) {
 194                     krb5_clear_error_string(context);
 195                     ret = ENOENT;
 196                     free_AD_KDCIssued(&child);
 197                     goto out;
 198                 }
 199             }
 200             ret = find_type_in_ad(context, type, data, found, failp, sessionkey,
 201                                   &child.elements, level + 1);
 202             free_AD_KDCIssued(&child);
 203             if (ret)
 204                 goto out;
 205             break;
 206         }
 207 #endif
 208         case KRB5_AUTHDATA_AND_OR:
 209             if (!failp)
 210                 break;
 211             krb5_set_error_string(context, "Authorization data contains "
 212                                   "AND-OR element that is unknown to the "
 213                                   "application");
 214             ret = ENOENT; /* XXX */
 215             goto out;
 216         default:
 217             if (!failp)
 218                 break;
 219             krb5_set_error_string(context, "Authorization data contains "
 220                                   "unknown type (%d) ", ad->val[i].ad_type);
 221             ret = ENOENT; /* XXX */
 222             goto out;
 223         }
 224     }
 225 out:
 226     if (ret) {
 227         if (*found) {
 228             krb5_data_free(data);
 229             *found = 0;
 230         }
 231     }
 232     return ret;
 233 }
 234
 235 int
 236 _krb5_find_type_in_ad(krb5_context context,
 237                       int type,
 238                       krb5_data *data,
 239                       krb5_boolean *found,
 240                       krb5_keyblock *sessionkey,
 241                       const AuthorizationData *ad)
 242 {
 243     krb5_data_zero(data);
 244     return find_type_in_ad(context, type, data, found, TRUE, sessionkey, ad, 0);
 245 }
 246
 247
 248 /*
 249  * Extract the authorization data type of `type' from the
 250  * 'ticket'. Store the field in `data'. This function is to use for
 251  * kerberos applications.
 252  */
 253
 254 krb5_error_code KRB5_LIB_FUNCTION
 255 krb5_ticket_get_authorization_data_type(krb5_context context,
 256                                         krb5_ticket *ticket,
 257                                         int type,
 258                                         krb5_data *data)
 259 {
 260     AuthorizationData *ad;
 261     krb5_error_code ret;
 262     krb5_boolean found = 0;
 263
 264     ad = ticket->ticket.authorization_data;
 265     if (ticket->ticket.authorization_data == NULL) {
 266         krb5_set_error_string(context, "Ticket have not authorization data");
 267         return ENOENT; /* XXX */
 268     }
 269
 270     ret = _krb5_find_type_in_ad(context, type, data, &found, &ticket->ticket.key,
 271                                 ticket->ticket.authorization_data);
 272     if (ret)
 273         return ret;
 274     if (!found) {
 275         krb5_set_error_string(context, "Ticket have not authorization "
 276                           "data of type %d", type);
 277         return ENOENT; /* XXX */
 278     }
 279     return 0;
 280 }