convert_creds.c revision 120945
1/* 2 * Copyright (c) 1997 - 2002 Kungliga Tekniska H�gskolan 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" 35RCSID("$Id: convert_creds.c,v 1.26 2003/03/18 03:11:16 lha Exp $"); 36 37#include "krb5-v4compat.h" 38 39static krb5_error_code 40check_ticket_flags(TicketFlags f) 41{ 42 return 0; /* maybe add some more tests here? */ 43} 44 45/* include this here, to avoid dependencies on libkrb */ 46 47static const int _tkt_lifetimes[TKTLIFENUMFIXED] = { 48 38400, 41055, 43894, 46929, 50174, 53643, 57352, 61318, 49 65558, 70091, 74937, 80119, 85658, 91581, 97914, 104684, 50 111922, 119661, 127935, 136781, 146239, 156350, 167161, 178720, 51 191077, 204289, 218415, 233517, 249664, 266926, 285383, 305116, 52 326213, 348769, 372885, 398668, 426234, 455705, 487215, 520904, 53 556921, 595430, 636601, 680618, 727680, 777995, 831789, 889303, 54 950794, 1016537, 1086825, 1161973, 1242318, 1328218, 1420057, 1518247, 55 1623226, 1735464, 1855462, 1983758, 2120925, 2267576, 2424367, 2592000 56}; 57 58int 59_krb5_krb_time_to_life(time_t start, time_t end) 60{ 61 int i; 62 time_t life = end - start; 63 64 if (life > MAXTKTLIFETIME || life <= 0) 65 return 0; 66#if 0 67 if (krb_no_long_lifetimes) 68 return (life + 5*60 - 1)/(5*60); 69#endif 70 71 if (end >= NEVERDATE) 72 return TKTLIFENOEXPIRE; 73 if (life < _tkt_lifetimes[0]) 74 return (life + 5*60 - 1)/(5*60); 75 for (i=0; i<TKTLIFENUMFIXED; i++) 76 if (life <= _tkt_lifetimes[i]) 77 return i + TKTLIFEMINFIXED; 78 return 0; 79 80} 81 82time_t 83_krb5_krb_life_to_time(int start, int life_) 84{ 85 unsigned char life = (unsigned char) life_; 86 87#if 0 88 if (krb_no_long_lifetimes) 89 return start + life*5*60; 90#endif 91 92 if (life == TKTLIFENOEXPIRE) 93 return NEVERDATE; 94 if (life < TKTLIFEMINFIXED) 95 return start + life*5*60; 96 if (life > TKTLIFEMAXFIXED) 97 return start + MAXTKTLIFETIME; 98 return start + _tkt_lifetimes[life - TKTLIFEMINFIXED]; 99} 100 101 102/* Convert the v5 credentials in `in_cred' to v4-dito in `v4creds'. 103 * This is done by sending them to the 524 function in the KDC. If 104 * `in_cred' doesn't contain a DES session key, then a new one is 105 * gotten from the KDC and stored in the cred cache `ccache'. 106 */ 107 108krb5_error_code 109krb524_convert_creds_kdc(krb5_context context, 110 krb5_creds *in_cred, 111 struct credentials *v4creds) 112{ 113 krb5_error_code ret; 114 krb5_data reply; 115 krb5_storage *sp; 116 int32_t tmp; 117 krb5_data ticket; 118 char realm[REALM_SZ]; 119 krb5_creds *v5_creds = in_cred; 120 121 ret = check_ticket_flags(v5_creds->flags.b); 122 if(ret) 123 goto out2; 124 125 { 126 krb5_krbhst_handle handle; 127 128 ret = krb5_krbhst_init(context, 129 *krb5_princ_realm(context, 130 v5_creds->server), 131 KRB5_KRBHST_KRB524, 132 &handle); 133 if (ret) 134 goto out2; 135 136 ret = krb5_sendto (context, 137 &v5_creds->ticket, 138 handle, 139 &reply); 140 krb5_krbhst_free(context, handle); 141 if (ret) 142 goto out2; 143 } 144 sp = krb5_storage_from_mem(reply.data, reply.length); 145 if(sp == NULL) { 146 ret = ENOMEM; 147 krb5_set_error_string (context, "malloc: out of memory"); 148 goto out2; 149 } 150 krb5_ret_int32(sp, &tmp); 151 ret = tmp; 152 if(ret == 0) { 153 memset(v4creds, 0, sizeof(*v4creds)); 154 ret = krb5_ret_int32(sp, &tmp); 155 if(ret) 156 goto out; 157 v4creds->kvno = tmp; 158 ret = krb5_ret_data(sp, &ticket); 159 if(ret) 160 goto out; 161 v4creds->ticket_st.length = ticket.length; 162 memcpy(v4creds->ticket_st.dat, ticket.data, ticket.length); 163 krb5_data_free(&ticket); 164 ret = krb5_524_conv_principal(context, 165 v5_creds->server, 166 v4creds->service, 167 v4creds->instance, 168 v4creds->realm); 169 if(ret) 170 goto out; 171 v4creds->issue_date = v5_creds->times.starttime; 172 v4creds->lifetime = _krb5_krb_time_to_life(v4creds->issue_date, 173 v5_creds->times.endtime); 174 ret = krb5_524_conv_principal(context, v5_creds->client, 175 v4creds->pname, 176 v4creds->pinst, 177 realm); 178 if(ret) 179 goto out; 180 memcpy(v4creds->session, v5_creds->session.keyvalue.data, 8); 181 } else { 182 krb5_set_error_string(context, "converting credentials: %s", 183 krb5_get_err_text(context, ret)); 184 } 185out: 186 krb5_storage_free(sp); 187 krb5_data_free(&reply); 188out2: 189 if (v5_creds != in_cred) 190 krb5_free_creds (context, v5_creds); 191 return ret; 192} 193 194krb5_error_code 195krb524_convert_creds_kdc_ccache(krb5_context context, 196 krb5_ccache ccache, 197 krb5_creds *in_cred, 198 struct credentials *v4creds) 199{ 200 krb5_error_code ret; 201 krb5_creds *v5_creds = in_cred; 202 krb5_keytype keytype; 203 204 keytype = v5_creds->session.keytype; 205 206 if (keytype != ENCTYPE_DES_CBC_CRC) { 207 /* MIT krb524d doesn't like nothing but des-cbc-crc tickets, 208 so go get one */ 209 krb5_creds template; 210 211 memset (&template, 0, sizeof(template)); 212 template.session.keytype = ENCTYPE_DES_CBC_CRC; 213 ret = krb5_copy_principal (context, in_cred->client, &template.client); 214 if (ret) { 215 krb5_free_creds_contents (context, &template); 216 return ret; 217 } 218 ret = krb5_copy_principal (context, in_cred->server, &template.server); 219 if (ret) { 220 krb5_free_creds_contents (context, &template); 221 return ret; 222 } 223 224 ret = krb5_get_credentials (context, 0, ccache, 225 &template, &v5_creds); 226 krb5_free_creds_contents (context, &template); 227 if (ret) 228 return ret; 229 } 230 231 ret = krb524_convert_creds_kdc(context, v5_creds, v4creds); 232 233 if (v5_creds != in_cred) 234 krb5_free_creds (context, v5_creds); 235 return ret; 236} 237