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" 35 36 RCSID("$Id: verify_init.c,v 1.17 2002/08/20 14:47:59 joda Exp $"); 37 38 void 39 krb5_verify_init_creds_opt_init(krb5_verify_init_creds_opt *options) 40 { 41 memset (options, 0, sizeof(*options)); 42 } 43 44 void 45 krb5_verify_init_creds_opt_set_ap_req_nofail(krb5_verify_init_creds_opt *options, 46 int ap_req_nofail) 47 { 48 options->flags |= KRB5_VERIFY_INIT_CREDS_OPT_AP_REQ_NOFAIL; 49 options->ap_req_nofail = ap_req_nofail; 50 } 51 52 /* 53 * 54 */ 55 56 static krb5_boolean 57 fail_verify_is_ok (krb5_context context, 58 krb5_verify_init_creds_opt *options) 59 { 60 if ((options->flags & KRB5_VERIFY_INIT_CREDS_OPT_AP_REQ_NOFAIL 61 && options->ap_req_nofail != 0) 62 || krb5_config_get_bool (context, 63 NULL, 64 "libdefaults", 65 "verify_ap_req_nofail", 66 NULL)) 67 return FALSE; 68 else 69 return TRUE; 70 } 71 72 krb5_error_code 73 krb5_verify_init_creds(krb5_context context, 74 krb5_creds *creds, 75 krb5_principal ap_req_server, 76 krb5_keytab ap_req_keytab, 77 krb5_ccache *ccache, 78 krb5_verify_init_creds_opt *options) 79 { 80 krb5_error_code ret; 81 krb5_data req; 82 krb5_ccache local_ccache = NULL; 83 krb5_keytab_entry entry; 84 krb5_creds *new_creds = NULL; 85 krb5_auth_context auth_context = NULL; 86 krb5_principal server = NULL; 87 krb5_keytab keytab = NULL; 88 89 krb5_data_zero (&req); 90 memset (&entry, 0, sizeof(entry)); 91 92 if (ap_req_server == NULL) { 93 char local_hostname[MAXHOSTNAMELEN]; 94 95 if (gethostname (local_hostname, sizeof(local_hostname)) < 0) { 96 ret = errno; 97 krb5_set_error_string (context, "gethostname: %s", 98 strerror(ret)); 99 return ret; 100 } 101 102 ret = krb5_sname_to_principal (context, 103 local_hostname, 104 "host", 105 KRB5_NT_SRV_HST, 106 &server); 107 if (ret) 108 goto cleanup; 109 } else 110 server = ap_req_server; 111 112 if (ap_req_keytab == NULL) { 113 ret = krb5_kt_default (context, &keytab); 114 if (ret) 115 goto cleanup; 116 } else 117 keytab = ap_req_keytab; 118 119 if (ccache && *ccache) 120 local_ccache = *ccache; 121 else { 122 ret = krb5_cc_gen_new (context, &krb5_mcc_ops, &local_ccache); 123 if (ret) 124 goto cleanup; 125 ret = krb5_cc_initialize (context, 126 local_ccache, 127 creds->client); 128 if (ret) 129 goto cleanup; 130 ret = krb5_cc_store_cred (context, 131 local_ccache, 132 creds); 133 if (ret) 134 goto cleanup; 135 } 136 137 if (!krb5_principal_compare (context, server, creds->server)) { 138 krb5_creds match_cred; 139 140 memset (&match_cred, 0, sizeof(match_cred)); 141 142 match_cred.client = creds->client; 143 match_cred.server = server; 144 145 ret = krb5_get_credentials (context, 146 0, 147 local_ccache, 148 &match_cred, 149 &new_creds); 150 if (ret) { 151 if (fail_verify_is_ok (context, options)) 152 ret = 0; 153 goto cleanup; 154 } 155 creds = new_creds; 156 } 157 158 ret = krb5_mk_req_extended (context, 159 &auth_context, 160 0, 161 NULL, 162 creds, 163 &req); 164 165 krb5_auth_con_free (context, auth_context); 166 auth_context = NULL; 167 168 if (ret) 169 goto cleanup; 170 171 ret = krb5_rd_req (context, 172 &auth_context, 173 &req, 174 server, 175 keytab, 176 0, 177 NULL); 178 179 if (ret == KRB5_KT_NOTFOUND && fail_verify_is_ok (context, options)) 180 ret = 0; 181 cleanup: 182 if (auth_context) 183 krb5_auth_con_free (context, auth_context); 184 krb5_data_free (&req); 185 krb5_kt_free_entry (context, &entry); 186 if (new_creds != NULL) 187 krb5_free_creds (context, new_creds); 188 if (ap_req_server == NULL && server) 189 krb5_free_principal (context, server); 190 if (ap_req_keytab == NULL && keytab) 191 krb5_kt_close (context, keytab); 192 if (local_ccache != NULL 193 && 194 (ccache == NULL 195 || (ret != 0 && *ccache == NULL))) 196 krb5_cc_destroy (context, local_ccache); 197 198 if (ret == 0 && ccache != NULL && *ccache == NULL) 199 *ccache = local_ccache; 200 201 return ret; 202 } 203