/* * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "krb5_locl.h" RCSID("$Id: convert_creds.c,v 1.26 2003/03/18 03:11:16 lha Exp $"); #include "krb5-v4compat.h" static krb5_error_code check_ticket_flags(TicketFlags f) { return 0; /* maybe add some more tests here? */ } /* include this here, to avoid dependencies on libkrb */ static const int _tkt_lifetimes[TKTLIFENUMFIXED] = { 38400, 41055, 43894, 46929, 50174, 53643, 57352, 61318, 65558, 70091, 74937, 80119, 85658, 91581, 97914, 104684, 111922, 119661, 127935, 136781, 146239, 156350, 167161, 178720, 191077, 204289, 218415, 233517, 249664, 266926, 285383, 305116, 326213, 348769, 372885, 398668, 426234, 455705, 487215, 520904, 556921, 595430, 636601, 680618, 727680, 777995, 831789, 889303, 950794, 1016537, 1086825, 1161973, 1242318, 1328218, 1420057, 1518247, 1623226, 1735464, 1855462, 1983758, 2120925, 2267576, 2424367, 2592000 }; int _krb5_krb_time_to_life(time_t start, time_t end) { int i; time_t life = end - start; if (life > MAXTKTLIFETIME || life <= 0) return 0; #if 0 if (krb_no_long_lifetimes) return (life + 5*60 - 1)/(5*60); #endif if (end >= NEVERDATE) return TKTLIFENOEXPIRE; if (life < _tkt_lifetimes[0]) return (life + 5*60 - 1)/(5*60); for (i=0; i TKTLIFEMAXFIXED) return start + MAXTKTLIFETIME; return start + _tkt_lifetimes[life - TKTLIFEMINFIXED]; } /* Convert the v5 credentials in `in_cred' to v4-dito in `v4creds'. * This is done by sending them to the 524 function in the KDC. If * `in_cred' doesn't contain a DES session key, then a new one is * gotten from the KDC and stored in the cred cache `ccache'. */ krb5_error_code krb524_convert_creds_kdc(krb5_context context, krb5_creds *in_cred, struct credentials *v4creds) { krb5_error_code ret; krb5_data reply; krb5_storage *sp; int32_t tmp; krb5_data ticket; char realm[REALM_SZ]; krb5_creds *v5_creds = in_cred; ret = check_ticket_flags(v5_creds->flags.b); if(ret) goto out2; { krb5_krbhst_handle handle; ret = krb5_krbhst_init(context, *krb5_princ_realm(context, v5_creds->server), KRB5_KRBHST_KRB524, &handle); if (ret) goto out2; ret = krb5_sendto (context, &v5_creds->ticket, handle, &reply); krb5_krbhst_free(context, handle); if (ret) goto out2; } sp = krb5_storage_from_mem(reply.data, reply.length); if(sp == NULL) { ret = ENOMEM; krb5_set_error_string (context, "malloc: out of memory"); goto out2; } krb5_ret_int32(sp, &tmp); ret = tmp; if(ret == 0) { memset(v4creds, 0, sizeof(*v4creds)); ret = krb5_ret_int32(sp, &tmp); if(ret) goto out; v4creds->kvno = tmp; ret = krb5_ret_data(sp, &ticket); if(ret) goto out; v4creds->ticket_st.length = ticket.length; memcpy(v4creds->ticket_st.dat, ticket.data, ticket.length); krb5_data_free(&ticket); ret = krb5_524_conv_principal(context, v5_creds->server, v4creds->service, v4creds->instance, v4creds->realm); if(ret) goto out; v4creds->issue_date = v5_creds->times.starttime; v4creds->lifetime = _krb5_krb_time_to_life(v4creds->issue_date, v5_creds->times.endtime); ret = krb5_524_conv_principal(context, v5_creds->client, v4creds->pname, v4creds->pinst, realm); if(ret) goto out; memcpy(v4creds->session, v5_creds->session.keyvalue.data, 8); } else { krb5_set_error_string(context, "converting credentials: %s", krb5_get_err_text(context, ret)); } out: krb5_storage_free(sp); krb5_data_free(&reply); out2: if (v5_creds != in_cred) krb5_free_creds (context, v5_creds); return ret; } krb5_error_code krb524_convert_creds_kdc_ccache(krb5_context context, krb5_ccache ccache, krb5_creds *in_cred, struct credentials *v4creds) { krb5_error_code ret; krb5_creds *v5_creds = in_cred; krb5_keytype keytype; keytype = v5_creds->session.keytype; if (keytype != ENCTYPE_DES_CBC_CRC) { /* MIT krb524d doesn't like nothing but des-cbc-crc tickets, so go get one */ krb5_creds template; memset (&template, 0, sizeof(template)); template.session.keytype = ENCTYPE_DES_CBC_CRC; ret = krb5_copy_principal (context, in_cred->client, &template.client); if (ret) { krb5_free_creds_contents (context, &template); return ret; } ret = krb5_copy_principal (context, in_cred->server, &template.server); if (ret) { krb5_free_creds_contents (context, &template); return ret; } ret = krb5_get_credentials (context, 0, ccache, &template, &v5_creds); krb5_free_creds_contents (context, &template); if (ret) return ret; } ret = krb524_convert_creds_kdc(context, v5_creds, v4creds); if (v5_creds != in_cred) krb5_free_creds (context, v5_creds); return ret; }