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