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

   1 /*
   2  * Copyright (c) 1997 - 2004 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 __RCSID("$Heimdal: convert_creds.c 22050 2007-11-11 11:20:46Z lha $"
  36         "$NetBSD$");
  37
  38 #include "krb5-v4compat.h"
  39
  40 static krb5_error_code
  41 check_ticket_flags(TicketFlags f)
  42 {
  43     return 0; /* maybe add some more tests here? */
  44 }
  45
  46 /**
  47  * Convert the v5 credentials in in_cred to v4-dito in v4creds.  This
  48  * is done by sending them to the 524 function in the KDC.  If
  49  * `in_cred' doesn't contain a DES session key, then a new one is
  50  * gotten from the KDC and stored in the cred cache `ccache'.
  51  *
  52  * @param context Kerberos 5 context.
  53  * @param in_cred the credential to convert
  54  * @param v4creds the converted credential
  55  *
  56  * @return Returns 0 to indicate success. Otherwise an kerberos et
  57  * error code is returned, see krb5_get_error_message().
  58  *
  59  * @ingroup krb5_v4compat
  60  */
  61
  62 krb5_error_code KRB5_LIB_FUNCTION
  63 krb524_convert_creds_kdc(krb5_context context,
  64                          krb5_creds *in_cred,
  65                          struct credentials *v4creds)
  66 {
  67     krb5_error_code ret;
  68     krb5_data reply;
  69     krb5_storage *sp;
  70     int32_t tmp;
  71     krb5_data ticket;
  72     char realm[REALM_SZ];
  73     krb5_creds *v5_creds = in_cred;
  74
  75     ret = check_ticket_flags(v5_creds->flags.b);
  76     if(ret)
  77         goto out2;
  78
  79     {
  80         krb5_krbhst_handle handle;
  81
  82         ret = krb5_krbhst_init(context,
  83                                krb5_principal_get_realm(context,
  84                                                         v5_creds->server),
  85                                KRB5_KRBHST_KRB524,
  86                                &handle);
  87         if (ret)
  88             goto out2;
  89
  90         ret = krb5_sendto (context,
  91                            &v5_creds->ticket,
  92                            handle,
  93                            &reply);
  94         krb5_krbhst_free(context, handle);
  95         if (ret)
  96             goto out2;
  97     }
  98     sp = krb5_storage_from_mem(reply.data, reply.length);
  99     if(sp == NULL) {
 100         ret = ENOMEM;
 101         krb5_set_error_string (context, "malloc: out of memory");
 102         goto out2;
 103     }
 104     krb5_ret_int32(sp, &tmp);
 105     ret = tmp;
 106     if(ret == 0) {
 107         memset(v4creds, 0, sizeof(*v4creds));
 108         ret = krb5_ret_int32(sp, &tmp);
 109         if(ret)
 110             goto out;
 111         v4creds->kvno = tmp;
 112         ret = krb5_ret_data(sp, &ticket);
 113         if(ret)
 114             goto out;
 115         v4creds->ticket_st.length = ticket.length;
 116         memcpy(v4creds->ticket_st.dat, ticket.data, ticket.length);
 117         krb5_data_free(&ticket);
 118         ret = krb5_524_conv_principal(context,
 119                                       v5_creds->server,
 120                                       v4creds->service,
 121                                       v4creds->instance,
 122                                       v4creds->realm);
 123         if(ret)
 124             goto out;
 125         v4creds->issue_date = v5_creds->times.starttime;
 126         v4creds->lifetime = _krb5_krb_time_to_life(v4creds->issue_date,
 127                                                    v5_creds->times.endtime);
 128         ret = krb5_524_conv_principal(context, v5_creds->client,
 129                                       v4creds->pname,
 130                                       v4creds->pinst,
 131                                       realm);
 132         if(ret)
 133             goto out;
 134         memcpy(v4creds->session, v5_creds->session.keyvalue.data, 8);
 135     } else {
 136         krb5_set_error_string(context, "converting credentials: %s",
 137                               krb5_get_err_text(context, ret));
 138     }
 139 out:
 140     krb5_storage_free(sp);
 141     krb5_data_free(&reply);
 142 out2:
 143     if (v5_creds != in_cred)
 144         krb5_free_creds (context, v5_creds);
 145     return ret;
 146 }
 147
 148 /**
 149  * Convert the v5 credentials in in_cred to v4-dito in v4creds,
 150  * check the credential cache ccache before checking with the KDC.
 151  *
 152  * @param context Kerberos 5 context.
 153  * @param ccache credential cache used to check for des-ticket.
 154  * @param in_cred the credential to convert
 155  * @param v4creds the converted credential
 156  *
 157  * @return Returns 0 to indicate success. Otherwise an kerberos et
 158  * error code is returned, see krb5_get_error_message().
 159  *
 160  * @ingroup krb5_v4compat
 161  */
 162
 163 krb5_error_code KRB5_LIB_FUNCTION
 164 krb524_convert_creds_kdc_ccache(krb5_context context,
 165                                 krb5_ccache ccache,
 166                                 krb5_creds *in_cred,
 167                                 struct credentials *v4creds)
 168 {
 169     krb5_error_code ret;
 170     krb5_creds *v5_creds = in_cred;
 171     krb5_keytype keytype;
 172
 173     keytype = v5_creds->session.keytype;
 174
 175     if (keytype != ENCTYPE_DES_CBC_CRC) {
 176         /* MIT krb524d doesn't like nothing but des-cbc-crc tickets,
 177            so go get one */
 178         krb5_creds template;
 179
 180         memset (&template, 0, sizeof(template));
 181         template.session.keytype = ENCTYPE_DES_CBC_CRC;
 182         ret = krb5_copy_principal (context, in_cred->client, &template.client);
 183         if (ret) {
 184             krb5_free_cred_contents (context, &template);
 185             return ret;
 186         }
 187         ret = krb5_copy_principal (context, in_cred->server, &template.server);
 188         if (ret) {
 189             krb5_free_cred_contents (context, &template);
 190             return ret;
 191         }
 192
 193         ret = krb5_get_credentials (context, 0, ccache,
 194                                     &template, &v5_creds);
 195         krb5_free_cred_contents (context, &template);
 196         if (ret)
 197             return ret;
 198     }
 199
 200     ret = krb524_convert_creds_kdc(context, v5_creds, v4creds);
 201
 202     if (v5_creds != in_cred)
 203         krb5_free_creds (context, v5_creds);
 204     return ret;
 205 }