1 /* $NetBSD: verify_init.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "krb5_locl.h" 37 38 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 39 krb5_verify_init_creds_opt_init(krb5_verify_init_creds_opt *options) 40 { 41 memset (options, 0, sizeof(*options)); 42 } 43 44 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 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_creds *new_creds = NULL; 84 krb5_auth_context auth_context = NULL; 85 krb5_principal server = NULL; 86 krb5_keytab keytab = NULL; 87 88 krb5_data_zero (&req); 89 90 if (ap_req_server == NULL) { 91 char local_hostname[MAXHOSTNAMELEN]; 92 93 if (gethostname (local_hostname, sizeof(local_hostname)) < 0) { 94 ret = errno; 95 krb5_set_error_message (context, ret, "gethostname: %s", 96 strerror(ret)); 97 return ret; 98 } 99 100 ret = krb5_sname_to_principal (context, 101 local_hostname, 102 "host", 103 KRB5_NT_SRV_HST, 104 &server); 105 if (ret) 106 goto cleanup; 107 } else 108 server = ap_req_server; 109 110 if (ap_req_keytab == NULL) { 111 ret = krb5_kt_default (context, &keytab); 112 if (ret) 113 goto cleanup; 114 } else 115 keytab = ap_req_keytab; 116 117 if (ccache && *ccache) 118 local_ccache = *ccache; 119 else { 120 ret = krb5_cc_new_unique(context, krb5_cc_type_memory, 121 NULL, &local_ccache); 122 if (ret) 123 goto cleanup; 124 ret = krb5_cc_initialize (context, 125 local_ccache, 126 creds->client); 127 if (ret) 128 goto cleanup; 129 ret = krb5_cc_store_cred (context, 130 local_ccache, 131 creds); 132 if (ret) 133 goto cleanup; 134 } 135 136 if (!krb5_principal_compare (context, server, creds->server)) { 137 krb5_creds match_cred; 138 139 memset (&match_cred, 0, sizeof(match_cred)); 140 141 match_cred.client = creds->client; 142 match_cred.server = server; 143 144 ret = krb5_get_credentials (context, 145 0, 146 local_ccache, 147 &match_cred, 148 &new_creds); 149 if (ret) { 150 if (fail_verify_is_ok (context, options)) 151 ret = 0; 152 goto cleanup; 153 } 154 creds = new_creds; 155 } 156 157 ret = krb5_mk_req_extended (context, 158 &auth_context, 159 0, 160 NULL, 161 creds, 162 &req); 163 164 krb5_auth_con_free (context, auth_context); 165 auth_context = NULL; 166 167 if (ret) 168 goto cleanup; 169 170 ret = krb5_rd_req (context, 171 &auth_context, 172 &req, 173 server, 174 keytab, 175 0, 176 NULL); 177 178 if (ret == KRB5_KT_NOTFOUND && fail_verify_is_ok (context, options)) 179 ret = 0; 180 cleanup: 181 if (auth_context) 182 krb5_auth_con_free (context, auth_context); 183 krb5_data_free (&req); 184 if (new_creds != NULL) 185 krb5_free_creds (context, new_creds); 186 if (ap_req_server == NULL && server) 187 krb5_free_principal (context, server); 188 if (ap_req_keytab == NULL && keytab) 189 krb5_kt_close (context, keytab); 190 if (local_ccache != NULL 191 && 192 (ccache == NULL 193 || (ret != 0 && *ccache == NULL))) 194 krb5_cc_destroy (context, local_ccache); 195 196 if (ret == 0 && ccache != NULL && *ccache == NULL) 197 *ccache = local_ccache; 198 199 return ret; 200 } 201 202 /** 203 * Validate the newly fetch credential, see also krb5_verify_init_creds(). 204 * 205 * @param context a Kerberos 5 context 206 * @param creds the credentials to verify 207 * @param client the client name to match up 208 * @param ccache the credential cache to use 209 * @param service a service name to use, used with 210 * krb5_sname_to_principal() to build a hostname to use to 211 * verify. 212 * 213 * @ingroup krb5_ccache 214 */ 215 216 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 217 krb5_get_validated_creds(krb5_context context, 218 krb5_creds *creds, 219 krb5_principal client, 220 krb5_ccache ccache, 221 char *service) 222 { 223 krb5_verify_init_creds_opt vopt; 224 krb5_principal server; 225 krb5_error_code ret; 226 227 if (krb5_principal_compare(context, creds->client, client) != TRUE) { 228 krb5_set_error_message(context, KRB5_PRINC_NOMATCH, 229 N_("Validation credentials and client " 230 "doesn't match", "")); 231 return KRB5_PRINC_NOMATCH; 232 } 233 234 ret = krb5_sname_to_principal (context, NULL, service, 235 KRB5_NT_SRV_HST, &server); 236 if(ret) 237 return ret; 238 239 krb5_verify_init_creds_opt_init(&vopt); 240 241 ret = krb5_verify_init_creds(context, creds, server, NULL, NULL, &vopt); 242 krb5_free_principal(context, server); 243 244 return ret; 245 } 246