205 lines
6.1 KiB
C
205 lines
6.1 KiB
C
/*
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* Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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RCSID("$Id: convert_creds.c 22050 2007-11-11 11:20:46Z lha $");
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#include "krb5-v4compat.h"
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static krb5_error_code
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check_ticket_flags(TicketFlags f)
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{
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return 0; /* maybe add some more tests here? */
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}
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/**
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* Convert the v5 credentials in in_cred to v4-dito in v4creds. This
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* is done by sending them to the 524 function in the KDC. If
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* `in_cred' doesn't contain a DES session key, then a new one is
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* gotten from the KDC and stored in the cred cache `ccache'.
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*
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* @param context Kerberos 5 context.
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* @param in_cred the credential to convert
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* @param v4creds the converted credential
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*
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* @return Returns 0 to indicate success. Otherwise an kerberos et
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* error code is returned, see krb5_get_error_message().
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*
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* @ingroup krb5_v4compat
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*/
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krb5_error_code KRB5_LIB_FUNCTION
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krb524_convert_creds_kdc(krb5_context context,
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krb5_creds *in_cred,
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struct credentials *v4creds)
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{
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krb5_error_code ret;
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krb5_data reply;
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krb5_storage *sp;
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int32_t tmp;
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krb5_data ticket;
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char realm[REALM_SZ];
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krb5_creds *v5_creds = in_cred;
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ret = check_ticket_flags(v5_creds->flags.b);
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if(ret)
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goto out2;
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{
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krb5_krbhst_handle handle;
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ret = krb5_krbhst_init(context,
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krb5_principal_get_realm(context,
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v5_creds->server),
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KRB5_KRBHST_KRB524,
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&handle);
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if (ret)
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goto out2;
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ret = krb5_sendto (context,
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&v5_creds->ticket,
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handle,
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&reply);
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krb5_krbhst_free(context, handle);
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if (ret)
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goto out2;
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}
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sp = krb5_storage_from_mem(reply.data, reply.length);
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if(sp == NULL) {
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ret = ENOMEM;
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krb5_set_error_string (context, "malloc: out of memory");
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goto out2;
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}
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krb5_ret_int32(sp, &tmp);
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ret = tmp;
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if(ret == 0) {
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memset(v4creds, 0, sizeof(*v4creds));
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ret = krb5_ret_int32(sp, &tmp);
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if(ret)
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goto out;
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v4creds->kvno = tmp;
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ret = krb5_ret_data(sp, &ticket);
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if(ret)
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goto out;
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v4creds->ticket_st.length = ticket.length;
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memcpy(v4creds->ticket_st.dat, ticket.data, ticket.length);
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krb5_data_free(&ticket);
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ret = krb5_524_conv_principal(context,
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v5_creds->server,
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v4creds->service,
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v4creds->instance,
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v4creds->realm);
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if(ret)
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goto out;
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v4creds->issue_date = v5_creds->times.starttime;
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v4creds->lifetime = _krb5_krb_time_to_life(v4creds->issue_date,
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v5_creds->times.endtime);
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ret = krb5_524_conv_principal(context, v5_creds->client,
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v4creds->pname,
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v4creds->pinst,
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realm);
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if(ret)
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goto out;
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memcpy(v4creds->session, v5_creds->session.keyvalue.data, 8);
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} else {
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krb5_set_error_string(context, "converting credentials: %s",
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krb5_get_err_text(context, ret));
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}
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out:
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krb5_storage_free(sp);
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krb5_data_free(&reply);
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out2:
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if (v5_creds != in_cred)
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krb5_free_creds (context, v5_creds);
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return ret;
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}
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/**
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* Convert the v5 credentials in in_cred to v4-dito in v4creds,
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* check the credential cache ccache before checking with the KDC.
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*
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* @param context Kerberos 5 context.
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* @param ccache credential cache used to check for des-ticket.
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* @param in_cred the credential to convert
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* @param v4creds the converted credential
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*
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* @return Returns 0 to indicate success. Otherwise an kerberos et
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* error code is returned, see krb5_get_error_message().
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*
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* @ingroup krb5_v4compat
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*/
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krb5_error_code KRB5_LIB_FUNCTION
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krb524_convert_creds_kdc_ccache(krb5_context context,
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krb5_ccache ccache,
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krb5_creds *in_cred,
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struct credentials *v4creds)
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{
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krb5_error_code ret;
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krb5_creds *v5_creds = in_cred;
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krb5_keytype keytype;
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keytype = v5_creds->session.keytype;
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if (keytype != ENCTYPE_DES_CBC_CRC) {
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/* MIT krb524d doesn't like nothing but des-cbc-crc tickets,
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so go get one */
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krb5_creds template;
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memset (&template, 0, sizeof(template));
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template.session.keytype = ENCTYPE_DES_CBC_CRC;
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ret = krb5_copy_principal (context, in_cred->client, &template.client);
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if (ret) {
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krb5_free_cred_contents (context, &template);
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return ret;
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}
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ret = krb5_copy_principal (context, in_cred->server, &template.server);
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if (ret) {
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krb5_free_cred_contents (context, &template);
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return ret;
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}
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ret = krb5_get_credentials (context, 0, ccache,
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&template, &v5_creds);
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krb5_free_cred_contents (context, &template);
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if (ret)
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return ret;
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}
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ret = krb524_convert_creds_kdc(context, v5_creds, v4creds);
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if (v5_creds != in_cred)
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krb5_free_creds (context, v5_creds);
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return ret;
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}
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