1 /* 2 * Copyright (c) 1997, 1998 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 1.11 1999/12/02 17:05:13 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 == 1) 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; 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 return errno; 97 98 ret = krb5_sname_to_principal (context, 99 local_hostname, 100 "host", 101 KRB5_NT_SRV_HST, 102 &server); 103 if (ret) 104 goto cleanup; 105 } else 106 server = ap_req_server; 107 108 if (ap_req_keytab == NULL) { 109 ret = krb5_kt_default (context, &keytab); 110 if (ret) 111 goto cleanup; 112 } else 113 keytab = ap_req_keytab; 114 115 if (ccache && *ccache) 116 local_ccache = *ccache; 117 else { 118 ret = krb5_cc_gen_new (context, &krb5_mcc_ops, &local_ccache); 119 if (ret) 120 goto cleanup; 121 ret = krb5_cc_initialize (context, 122 local_ccache, 123 creds->client); 124 if (ret) 125 goto cleanup; 126 ret = krb5_cc_store_cred (context, 127 local_ccache, 128 creds); 129 if (ret) 130 goto cleanup; 131 } 132 133 if (!krb5_principal_compare (context, server, creds->server)) { 134 krb5_creds match_cred; 135 136 memset (&match_cred, 0, sizeof(match_cred)); 137 138 match_cred.client = creds->client; 139 match_cred.server = server; 140 141 ret = krb5_get_credentials (context, 142 0, 143 local_ccache, 144 &match_cred, 145 &new_creds); 146 if (ret) { 147 if (fail_verify_is_ok (context, options)) 148 ret = 0; 149 goto cleanup; 150 } 151 } else 152 new_creds = creds; 153 154 ret = krb5_mk_req_extended (context, 155 &auth_context, 156 0, 157 NULL, 158 new_creds, 159 &req); 160 161 krb5_auth_con_free (context, auth_context); 162 auth_context = NULL; 163 164 if (ret) 165 goto cleanup; 166 167 ret = krb5_rd_req (context, 168 &auth_context, 169 &req, 170 server, 171 keytab, 172 0, 173 NULL); 174 175 if (ret == KRB5_KT_NOTFOUND && fail_verify_is_ok (context, options)) 176 ret = 0; 177 cleanup: 178 if (auth_context) 179 krb5_auth_con_free (context, auth_context); 180 krb5_data_free (&req); 181 krb5_kt_free_entry (context, &entry); 182 if (new_creds) 183 krb5_free_creds (context, new_creds); 184 if (ap_req_server == NULL && server) 185 krb5_free_principal (context, server); 186 if (ap_req_keytab == NULL && keytab) 187 krb5_kt_close (context, keytab); 188 if (ccache == NULL 189 || (ret != 0 && *ccache == NULL)) 190 krb5_cc_destroy (context, local_ccache); 191 192 if (ret == 0 && ccache != NULL && *ccache == NULL) 193 *ccache = local_ccache; 194 195 return ret; 196 } 197